<?xml version="1.0" encoding="us-ascii" standalone="yes"?>
<!--XBRL Document Created with XBRLMaster-->
<!--Version: 2.3.08-->
<!--Based on XBRL 2.1-->
<!--Date of creation: 04/01/2026-->
<!--Software architectural design and coding: A'c Dharmapremananda Avt.-->
<!--Copyright (c) 2026 I-NET Business Solutions, Inc. All Rights Reserved.-->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://class.com/role/Cover" xlink:href="class-20251231.xsd#Cover" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConsolidatedBalanceSheets" xlink:href="class-20251231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="class-20251231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConsolidatedStatementsOfOperations" xlink:href="class-20251231.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityDeficit" xlink:href="class-20251231.xsd#ConsolidatedStatementsOfChangesInShareholdersEquityDeficit" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="class-20251231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/InsiderTradingArrangements" xlink:href="class-20251231.xsd#InsiderTradingArrangements" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentation" xlink:href="class-20251231.xsd#DescriptionOfTheBusinessAndBasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="class-20251231.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/PropertyAndEquipmentNet" xlink:href="class-20251231.xsd#PropertyAndEquipmentNet" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/InvestmentAccounts" xlink:href="class-20251231.xsd#InvestmentAccounts" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IntangibleAssets" xlink:href="class-20251231.xsd#IntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/Leases" xlink:href="class-20251231.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/AccruedLiabilitiesAndOtherPayables" xlink:href="class-20251231.xsd#AccruedLiabilitiesAndOtherPayables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxes" xlink:href="class-20251231.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedParties" xlink:href="class-20251231.xsd#RelatedParties" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotes" xlink:href="class-20251231.xsd#ConvertibleNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/WarrantLiabilities" xlink:href="class-20251231.xsd#WarrantLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RecurringFairValueMeasurements" xlink:href="class-20251231.xsd#RecurringFairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SegmentInformationAndRevenueAnalysis" xlink:href="class-20251231.xsd#SegmentInformationAndRevenueAnalysis" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/CommitmentsAndContingencies" xlink:href="class-20251231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/Equity" xlink:href="class-20251231.xsd#Equity" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConcentrationOfRisk" xlink:href="class-20251231.xsd#ConcentrationOfRisk" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SubsequentEvent" xlink:href="class-20251231.xsd#SubsequentEvent" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="class-20251231.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="class-20251231.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/PropertyAndEquipmentNetTables" xlink:href="class-20251231.xsd#PropertyAndEquipmentNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/InvestmentAccountsTables" xlink:href="class-20251231.xsd#InvestmentAccountsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IntangibleAssetsTables" xlink:href="class-20251231.xsd#IntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/LeasesTables" xlink:href="class-20251231.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/AccruedLiabilitiesAndOtherPayablesTables" xlink:href="class-20251231.xsd#AccruedLiabilitiesAndOtherPayablesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxesTables" xlink:href="class-20251231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedPartiesTables" xlink:href="class-20251231.xsd#RelatedPartiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesTables" xlink:href="class-20251231.xsd#ConvertibleNotesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/WarrantLiabilitiesTables" xlink:href="class-20251231.xsd#WarrantLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RecurringFairValueMeasurementsTables" xlink:href="class-20251231.xsd#RecurringFairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SegmentInformationAndRevenueAnalysisTables" xlink:href="class-20251231.xsd#SegmentInformationAndRevenueAnalysisTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/EquityTables" xlink:href="class-20251231.xsd#EquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentationDetailsNarrative" xlink:href="class-20251231.xsd#DescriptionOfTheBusinessAndBasisOfPresentationDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="class-20251231.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:href="class-20251231.xsd#SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/PropertyAndEquipmentNetDetails" xlink:href="class-20251231.xsd#PropertyAndEquipmentNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/PropertyAndEquipmentNetDetailsNarrative" xlink:href="class-20251231.xsd#PropertyAndEquipmentNetDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/InvestmentAccountsDetails" xlink:href="class-20251231.xsd#InvestmentAccountsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/InvestmentAccountsDetailsNarrative" xlink:href="class-20251231.xsd#InvestmentAccountsDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IntangibleAssetsDetails" xlink:href="class-20251231.xsd#IntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IntangibleAssetsDetailsNarrative" xlink:href="class-20251231.xsd#IntangibleAssetsDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/LeasesDetails" xlink:href="class-20251231.xsd#LeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/LeasesDetails1" xlink:href="class-20251231.xsd#LeasesDetails1" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/LeasesDetailsNarrative" xlink:href="class-20251231.xsd#LeasesDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/AccruedLiabilitiesAndOtherPayablesDetails" xlink:href="class-20251231.xsd#AccruedLiabilitiesAndOtherPayablesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxesDetails" xlink:href="class-20251231.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxesDetails1" xlink:href="class-20251231.xsd#IncomeTaxesDetails1" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxesDetails2" xlink:href="class-20251231.xsd#IncomeTaxesDetails2" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/IncomeTaxesDetailsNarrative" xlink:href="class-20251231.xsd#IncomeTaxesDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedPartiesDetails" xlink:href="class-20251231.xsd#RelatedPartiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedPartiesDetails1" xlink:href="class-20251231.xsd#RelatedPartiesDetails1" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedPartiesDetails2" xlink:href="class-20251231.xsd#RelatedPartiesDetails2" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RelatedPartiesDetails3" xlink:href="class-20251231.xsd#RelatedPartiesDetails3" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesPayableDetails" xlink:href="class-20251231.xsd#ConvertibleNotesPayableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesPayableDetails1" xlink:href="class-20251231.xsd#ConvertibleNotesPayableDetails1" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesPayableDetails2" xlink:href="class-20251231.xsd#ConvertibleNotesPayableDetails2" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesPayableDetails3" xlink:href="class-20251231.xsd#ConvertibleNotesPayableDetails3" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConvertibleNotesPayableDetailsNarrative" xlink:href="class-20251231.xsd#ConvertibleNotesPayableDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/WarrantLiabilitiesDetails" xlink:href="class-20251231.xsd#WarrantLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/WarrantLiabilitiesDetailsNarrative" xlink:href="class-20251231.xsd#WarrantLiabilitiesDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/RecurringFairValueMeasurementsDetails" xlink:href="class-20251231.xsd#RecurringFairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SegmentInformationAndRevenueAnalysisDetails" xlink:href="class-20251231.xsd#SegmentInformationAndRevenueAnalysisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/EquityDetails" xlink:href="class-20251231.xsd#EquityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/EquityDetailsNarrative" xlink:href="class-20251231.xsd#EquityDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/ConcentrationOfRiskDetailsNarrative" xlink:href="class-20251231.xsd#ConcentrationOfRiskDetailsNarrative" xlink:type="simple" />
  <link:roleRef roleURI="http://class.com/role/SubsequentEventDetailsNarrative" xlink:href="class-20251231.xsd#SubsequentEventDetailsNarrative" xlink:type="simple" />
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/Cover" xlink:title="00000001 - Document - Cover Page Information">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract" xlink:label="loc_deiCoverAbstract" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable" xlink:label="loc_deiDocumentInformationTable" />
    <link:presentationArc order="500" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiCoverAbstract" xlink:to="loc_deiDocumentInformationTable" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems" xlink:label="loc_deiDocumentInformationLineItems" />
    <link:presentationArc order="501" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationTable" xlink:to="loc_deiDocumentInformationLineItems" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName" xlink:label="loc_deiEntityRegistrantName" />
    <link:presentationArc order="0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityRegistrantName" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey" xlink:label="loc_deiEntityCentralIndexKey" />
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityCentralIndexKey" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType" xlink:label="loc_deiDocumentType" />
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentType" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag" xlink:label="loc_deiAmendmentFlag" />
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiAmendmentFlag" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_deiEntityVoluntaryFilers" />
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityVoluntaryFilers" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_deiCurrentFiscalYearEndDate" />
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiCurrentFiscalYearEndDate" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_deiEntityWellKnownSeasonedIssuer" />
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityWellKnownSeasonedIssuer" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness" xlink:label="loc_deiEntitySmallBusiness" />
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntitySmallBusiness" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany" xlink:label="loc_deiEntityShellCompany" />
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityShellCompany" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_deiEntityEmergingGrowthCompany" />
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityEmergingGrowthCompany" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_deiEntityCurrentReportingStatus" />
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityCurrentReportingStatus" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_deiDocumentPeriodEndDate" />
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentPeriodEndDate" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory" xlink:label="loc_deiEntityFilerCategory" />
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityFilerCategory" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_deiDocumentFiscalPeriodFocus" />
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentFiscalPeriodFocus" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_deiDocumentFiscalYearFocus" />
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentFiscalYearFocus" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityExTransitionPeriod" xlink:label="loc_deiEntityExTransitionPeriod" />
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityExTransitionPeriod" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_deiEntityCommonStockSharesOutstanding" />
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityCommonStockSharesOutstanding" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityPublicFloat" xlink:label="loc_deiEntityPublicFloat" />
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityPublicFloat" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport" xlink:label="loc_deiDocumentAnnualReport" />
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentAnnualReport" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport" xlink:label="loc_deiDocumentTransitionReport" />
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentTransitionReport" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag" xlink:label="loc_deiDocumentFinStmtErrorCorrectionFlag" />
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiDocumentFinStmtErrorCorrectionFlag" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber" xlink:label="loc_deiEntityFileNumber" />
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityFileNumber" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_deiEntityIncorporationStateCountryCode" />
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityIncorporationStateCountryCode" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_deiEntityTaxIdentificationNumber" />
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityTaxIdentificationNumber" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_deiEntityAddressAddressLine1" />
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityAddressAddressLine1" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_deiEntityAddressAddressLine2" />
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityAddressAddressLine2" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_deiEntityAddressCityOrTown" />
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityAddressCityOrTown" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_deiEntityAddressStateOrProvince" />
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityAddressStateOrProvince" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_deiEntityAddressPostalZipCode" />
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityAddressPostalZipCode" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode" xlink:label="loc_deiCityAreaCode" />
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiCityAreaCode" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag" xlink:label="loc_deiIcfrAuditorAttestationFlag" />
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiIcfrAuditorAttestationFlag" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber" xlink:label="loc_deiLocalPhoneNumber" />
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiLocalPhoneNumber" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle" xlink:label="loc_deiSecurity12bTitle" />
    <link:presentationArc order="32" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiSecurity12bTitle" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol" xlink:label="loc_deiTradingSymbol" />
    <link:presentationArc order="33" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiTradingSymbol" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName" xlink:label="loc_deiSecurityExchangeName" />
    <link:presentationArc order="34" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiSecurityExchangeName" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_deiEntityInteractiveDataCurrent" />
    <link:presentationArc order="35" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiEntityInteractiveDataCurrent" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorFirmId" xlink:label="loc_deiAuditorFirmId" />
    <link:presentationArc order="36" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiAuditorFirmId" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorName" xlink:label="loc_deiAuditorName" />
    <link:presentationArc order="37" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiAuditorName" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLocation" xlink:label="loc_deiAuditorLocation" />
    <link:presentationArc order="38" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_deiAuditorLocation" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_2373a1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_deiDocumentInformationLineItems" xlink:to="loc_us-gaapStatementClassOfStockAxis_2373a1" order="50" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_e7c9d0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_2373a1" xlink:to="loc_us-gaapClassOfStockDomain_e7c9d0" order="51" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassBOrdinarySharesMember" xlink:label="loc_classClassBOrdinarySharesMember_bf537e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_e7c9d0" xlink:to="loc_classClassBOrdinarySharesMember_bf537e" order="152" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RedeemableWarrantsMember" xlink:label="loc_classRedeemableWarrantsMember_23e6d4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_e7c9d0" xlink:to="loc_classRedeemableWarrantsMember_23e6d4" order="153" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConsolidatedBalanceSheets" xlink:title="110200 - Statement - CONSOLIDATED BALANCE SHEETS">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaapStatementOfFinancialPositionAbstract_10a728" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_70705d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfFinancialPositionAbstract_10a728" xlink:to="loc_us-gaapStatementTable_70705d" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_201099" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_70705d" xlink:to="loc_us-gaapStatementLineItems_201099" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_35a72d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_70705d" xlink:to="loc_us-gaapStatementClassOfStockAxis_35a72d" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_027bc7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_35a72d" xlink:to="loc_us-gaapClassOfStockDomain_027bc7" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_70d136" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_027bc7" xlink:to="loc_us-gaapCommonClassBMember_70d136" order="1021" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_a44f2b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_027bc7" xlink:to="loc_us-gaapCommonClassAMember_a44f2b" order="1022" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaapSeriesAPreferredStockMember_9aaedc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_027bc7" xlink:to="loc_us-gaapSeriesAPreferredStockMember_9aaedc" order="1023" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesCPreferredStockMember" xlink:label="loc_us-gaapSeriesCPreferredStockMember_4d69fd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_027bc7" xlink:to="loc_us-gaapSeriesCPreferredStockMember_4d69fd" order="1024" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesBPreferredStockMember" xlink:label="loc_us-gaapSeriesBPreferredStockMember_86f65c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_027bc7" xlink:to="loc_us-gaapSeriesBPreferredStockMember_86f65c" order="1025" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaapAssetsAbstract_1001dc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssetsAbstract_1001dc" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaapAssetsCurrentAbstract_e85587" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssetsCurrentAbstract_e85587" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e9e5fa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e9e5fa" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent_624cb9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent_624cb9" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DueFromRelatedPartyCurrent" xlink:label="loc_classDueFromRelatedPartyCurrent_7547be" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_classDueFromRelatedPartyCurrent_7547be" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaapAssetsCurrent_0bb73e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssetsCurrent_0bb73e" order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:label="loc_us-gaapAssetsNoncurrentAbstract_efc030" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssetsNoncurrentAbstract_efc030" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet_160c0b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet_160c0b" order="8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsNetExcludingGoodwill_56b27c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapIntangibleAssetsNetExcludingGoodwill_56b27c" order="9" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset_305c02" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset_305c02" order="10" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedInvestmentsNoncurrent" xlink:label="loc_us-gaapRestrictedInvestmentsNoncurrent_0d1d18" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapRestrictedInvestmentsNoncurrent_0d1d18" order="11" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments" xlink:label="loc_us-gaapInvestments_916264" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapInvestments_916264" order="12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsAssetsNoncurrent" xlink:label="loc_us-gaapDepositsAssetsNoncurrent_c41c6f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapDepositsAssetsNoncurrent_c41c6f" order="13" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaapAssetsNoncurrent_670c7b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssetsNoncurrent_670c7b" order="14" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets_3332d6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAssets_3332d6" order="15" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquityAbstract_fc6e9e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesAndStockholdersEquityAbstract_fc6e9e" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaapLiabilitiesCurrentAbstract_e44057" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesCurrentAbstract_e44057" order="17" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaapAccountsPayableCurrent_4b64ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAccountsPayableCurrent_4b64ed" order="18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaapInterestPayableCurrent_dcb365" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapInterestPayableCurrent_dcb365" order="19" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaapDeferredRevenueCurrent_7d500f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapDeferredRevenueCurrent_7d500f" order="20" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DueToRelatedPartyCurrent" xlink:label="loc_classDueToRelatedPartyCurrent_738f77" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_classDueToRelatedPartyCurrent_738f77" order="21" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaapOperatingLeaseLiabilityCurrent_013458" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapOperatingLeaseLiabilityCurrent_013458" order="22" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaapAccountsPayableAndOtherAccruedLiabilitiesCurrent_63e956" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAccountsPayableAndOtherAccruedLiabilitiesCurrent_63e956" order="23" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaapLiabilitiesCurrent_c8a93b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesCurrent_c8a93b" order="24" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaapLiabilitiesNoncurrentAbstract_26ad0a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesNoncurrentAbstract_26ad0a" order="25" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleLongTermNotesPayable" xlink:label="loc_us-gaapConvertibleLongTermNotesPayable_98d967" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapConvertibleLongTermNotesPayable_98d967" order="26" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaapOperatingLeaseLiabilityNoncurrent_ada692" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapOperatingLeaseLiabilityNoncurrent_ada692" order="27" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaapDeferredIncomeTaxLiabilitiesNet_2d00f0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapDeferredIncomeTaxLiabilitiesNet_2d00f0" order="28" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesNoncurrent" xlink:label="loc_classWarrantLiabilitiesNoncurrent_756684" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_classWarrantLiabilitiesNoncurrent_756684" order="29" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaapLiabilitiesNoncurrent_dd69bd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesNoncurrent_dd69bd" order="30" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities_83111d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilities_83111d" order="31" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaapCommitmentsAndContingencies_85a6a1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapCommitmentsAndContingencies_85a6a1" order="32" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaapStockholdersEquityAbstract_761923" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapStockholdersEquityAbstract_761923" order="33" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue_174a4a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapCommonStockValue_174a4a" order="34" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaapPreferredStockValue_c7ffe2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapPreferredStockValue_c7ffe2" order="35" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaapAdditionalPaidInCapital_9381af" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapAdditionalPaidInCapital_9381af" order="36" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit_4c6b7c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit_4c6b7c" order="37" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_25b900" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapStockholdersEquity_25b900" order="38" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquity_13fa6a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_201099" xlink:to="loc_us-gaapLiabilitiesAndStockholdersEquity_13fa6a" order="39" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:title="110201 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaapStatementOfFinancialPositionAbstract_bf3556" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_f37a10" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfFinancialPositionAbstract_bf3556" xlink:to="loc_us-gaapStatementTable_f37a10" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_7ea8dc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_f37a10" xlink:to="loc_us-gaapStatementLineItems_7ea8dc" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_4a8dd9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_f37a10" xlink:to="loc_us-gaapStatementClassOfStockAxis_4a8dd9" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_9846af" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_4a8dd9" xlink:to="loc_us-gaapClassOfStockDomain_9846af" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_b9a3be" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_9846af" xlink:to="loc_us-gaapCommonClassBMember_b9a3be" order="1011" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_5b13fc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_9846af" xlink:to="loc_us-gaapCommonClassAMember_5b13fc" order="1012" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaapSeriesAPreferredStockMember_674dc8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_9846af" xlink:to="loc_us-gaapSeriesAPreferredStockMember_674dc8" order="1013" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesCPreferredStockMember" xlink:label="loc_us-gaapSeriesCPreferredStockMember_29db10" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_9846af" xlink:to="loc_us-gaapSeriesCPreferredStockMember_29db10" order="1014" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesBPreferredStockMember" xlink:label="loc_us-gaapSeriesBPreferredStockMember_05c8c4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_9846af" xlink:to="loc_us-gaapSeriesBPreferredStockMember_05c8c4" order="1015" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaapPreferredStockParOrStatedValuePerShare_98da57" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapPreferredStockParOrStatedValuePerShare_98da57" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaapPreferredStockSharesAuthorized_0993b8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapPreferredStockSharesAuthorized_0993b8" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaapPreferredStockSharesIssued_4d82ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapPreferredStockSharesIssued_4d82ed" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaapPreferredStockSharesOutstanding_d14573" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapPreferredStockSharesOutstanding_d14573" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaapCommonStockParOrStatedValuePerShare_53da57" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapCommonStockParOrStatedValuePerShare_53da57" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaapCommonStockSharesAuthorized_1d8c81" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapCommonStockSharesAuthorized_1d8c81" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued_b9d649" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapCommonStockSharesIssued_b9d649" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaapCommonStockSharesOutstanding_a4f074" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_7ea8dc" xlink:to="loc_us-gaapCommonStockSharesOutstanding_a4f074" order="8" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConsolidatedStatementsOfOperations" xlink:title="124100 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaapIncomeStatementAbstract_66f2a9" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_cf0f09" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncomeStatementAbstract_66f2a9" xlink:to="loc_us-gaapStatementTable_cf0f09" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_57daf8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_cf0f09" xlink:to="loc_us-gaapStatementLineItems_57daf8" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_9df92d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_cf0f09" xlink:to="loc_us-gaapStatementClassOfStockAxis_9df92d" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_abd8d7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_9df92d" xlink:to="loc_us-gaapClassOfStockDomain_abd8d7" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassAPreferredMember" xlink:label="loc_classClassAPreferredMember_afee73" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_abd8d7" xlink:to="loc_classClassAPreferredMember_afee73" order="1011" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassACommonMember" xlink:label="loc_classClassACommonMember_9c1526" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_abd8d7" xlink:to="loc_classClassACommonMember_9c1526" order="1012" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassBCommonMember" xlink:label="loc_classClassBCommonMember_1997a0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_abd8d7" xlink:to="loc_classClassBCommonMember_1997a0" order="1013" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassBPreferredMember" xlink:label="loc_classClassBPreferredMember_c9e031" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_abd8d7" xlink:to="loc_classClassBPreferredMember_c9e031" order="1014" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassCPreferredMember" xlink:label="loc_classClassCPreferredMember_b280b1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_abd8d7" xlink:to="loc_classClassCPreferredMember_b280b1" order="1015" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaapRevenuesAbstract_7474c0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapRevenuesAbstract_7474c0" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RevenueFromServices" xlink:label="loc_classRevenueFromServices_6c1f43" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRevenuesAbstract_7474c0" xlink:to="loc_classRevenueFromServices_6c1f43" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RevenueFromConsultingServicesRelatedParty" xlink:label="loc_classRevenueFromConsultingServicesRelatedParty_8b716c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRevenuesAbstract_7474c0" xlink:to="loc_classRevenueFromConsultingServicesRelatedParty_8b716c" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues" xlink:label="loc_us-gaapRevenues_ba74f8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapRevenues_ba74f8" order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaapCostOfRevenueAbstract_4add28" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapCostOfRevenueAbstract_4add28" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaapCostOfGoodsAndServicesSold_2f5497" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapCostOfGoodsAndServicesSold_2f5497" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaapCostOfRevenue_b53829" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapCostOfRevenue_b53829" order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaapGrossProfit_f84cbd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapGrossProfit_f84cbd" order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaapOperatingExpensesAbstract_163335" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapOperatingExpensesAbstract_163335" order="9" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaapSellingAndMarketingExpense_b73cb5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapSellingAndMarketingExpense_b73cb5" order="10" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaapGeneralAndAdministrativeExpense_3360dd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapGeneralAndAdministrativeExpense_3360dd" order="11" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaapResearchAndDevelopmentExpense_f2d9ef" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapResearchAndDevelopmentExpense_f2d9ef" order="12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaapOperatingExpenses_53095d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapOperatingExpenses_53095d" order="13" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaapOperatingIncomeLoss_d821fd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapOperatingIncomeLoss_d821fd" order="14" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaapOtherNonoperatingIncomeExpenseAbstract_d621a8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapOtherNonoperatingIncomeExpenseAbstract_d621a8" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaapDerivativeGainLossOnDerivativeNet_28c38e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapDerivativeGainLossOnDerivativeNet_28c38e" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CryptoAssetRealizedGainLossNonoperating" xlink:label="loc_us-gaapCryptoAssetRealizedGainLossNonoperating_c06d4f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapCryptoAssetRealizedGainLossNonoperating_c06d4f" order="17" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_GainLossOnChangeInFairValueOfConvertibleDebt" xlink:label="loc_classGainLossOnChangeInFairValueOfConvertibleDebt_35a4c0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_classGainLossOnChangeInFairValueOfConvertibleDebt_35a4c0" order="18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived" xlink:label="loc_us-gaapImpairmentOfIntangibleAssetsFinitelived_6ac4cf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapImpairmentOfIntangibleAssetsFinitelived_6ac4cf" order="19" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingInterestExpense" xlink:label="loc_us-gaapFinancingInterestExpense_9709ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapFinancingInterestExpense_9709ed" order="20" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_StakingRewardsIncome" xlink:label="loc_classStakingRewardsIncome_e970e3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_classStakingRewardsIncome_e970e3" order="21" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaapGainsLossesOnExtinguishmentOfDebt_2c762b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapGainsLossesOnExtinguishmentOfDebt_2c762b" order="22" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_us-gaapInterestIncomeExpenseNonoperatingNet_c364b9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapInterestIncomeExpenseNonoperatingNet_c364b9" order="23" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaapOtherNonoperatingIncomeExpense_912dff" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapOtherNonoperatingIncomeExpense_912dff" order="24" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e3532f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e3532f" order="25" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit_fab505" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit_fab505" order="26" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss_71b9fc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapNetIncomeLoss_71b9fc" order="27" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaapWeightedAverageNumberOfDilutedSharesOutstanding_38bc12" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapWeightedAverageNumberOfDilutedSharesOutstanding_38bc12" order="28" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaapEarningsPerShareDiluted_456d10" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_57daf8" xlink:to="loc_us-gaapEarningsPerShareDiluted_456d10" order="29" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityDeficit" xlink:title="148600 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (DEFICIT)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaapStatementOfStockholdersEquityAbstract_546bc1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_c5abc4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfStockholdersEquityAbstract_546bc1" xlink:to="loc_us-gaapStatementTable_c5abc4" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_1c4b65" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_c5abc4" xlink:to="loc_us-gaapStatementLineItems_1c4b65" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis_bf483d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_c5abc4" xlink:to="loc_us-gaapStatementEquityComponentsAxis_bf483d" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_ee33d2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementEquityComponentsAxis_bf483d" xlink:to="loc_us-gaapEquityComponentDomain_ee33d2" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SeriesAPreferredStocksMember" xlink:label="loc_classSeriesAPreferredStocksMember_50a911" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_classSeriesAPreferredStocksMember_50a911" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SeriesBPreferredStocksMember" xlink:label="loc_classSeriesBPreferredStocksMember_33de93" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_classSeriesBPreferredStocksMember_33de93" order="1022" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassACommonStockMember" xlink:label="loc_classClassACommonStockMember_3bde4c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_classClassACommonStockMember_3bde4c" order="1023" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaapAdditionalPaidInCapitalMember_5b9a10" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_us-gaapAdditionalPaidInCapitalMember_5b9a10" order="1024" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SeriesCPreferredStocksMember" xlink:label="loc_classSeriesCPreferredStocksMember_3d2c80" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_classSeriesCPreferredStocksMember_3d2c80" order="1025" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassBCommonStockMember" xlink:label="loc_classClassBCommonStockMember_8aefb8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_classClassBCommonStockMember_8aefb8" order="1026" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaapRetainedEarningsMember_dfff44" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityComponentDomain_ee33d2" xlink:to="loc_us-gaapRetainedEarningsMember_dfff44" order="1027" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaapSharesIssued_fa940d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapSharesIssued_fa940d" order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_6d03d0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockholdersEquity_6d03d0" order="2" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_36c357" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_36c357" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices_14a3f9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices_14a3f9" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss_0f3af7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapNetIncomeLoss_0f3af7" order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_AdjustmentsToAdditionalPaidInCapitalReverseRecapitalizationAmount" xlink:label="loc_classAdjustmentsToAdditionalPaidInCapitalReverseRecapitalizationAmount_c6ec8e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_classAdjustmentsToAdditionalPaidInCapitalReverseRecapitalizationAmount_c6ec8e" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_f83f16" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_f83f16" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_31f564" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_31f564" order="8" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersShares" xlink:label="loc_classCommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersShares_6e907b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_classCommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersShares_6e907b" order="9" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersAmount" xlink:label="loc_classCommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersAmount_a51f45" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_classCommonStockIssuedToSpecialPurposeAcquisitionCompanyPublicShareholdersAmount_a51f45" order="10" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CapitalContributionFromPrivatePlacementShares" xlink:label="loc_classCapitalContributionFromPrivatePlacementShares_a06ca6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_classCapitalContributionFromPrivatePlacementShares_a06ca6" order="11" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CapitalContributionFromPrivatePlacementAmount" xlink:label="loc_classCapitalContributionFromPrivatePlacementAmount_d36d1c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_classCapitalContributionFromPrivatePlacementAmount_d36d1c" order="12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesEmployeeBenefitPlan_1255fa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesEmployeeBenefitPlan_1255fa" order="13" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueEmployeeBenefitPlan_9d2c2c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueEmployeeBenefitPlan_9d2c2c" order="14" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesShareBasedCompensation_5bd96e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesShareBasedCompensation_5bd96e" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueShareBasedCompensation_659eac" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueShareBasedCompensation_659eac" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="loc_us-gaapConversionOfStockSharesConverted1_9a7a45" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapConversionOfStockSharesConverted1_9a7a45" order="17" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockAmountConverted1" xlink:label="loc_us-gaapConversionOfStockAmountConverted1_dd30e7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapConversionOfStockAmountConverted1_dd30e7" order="18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesAcquisitions_195871" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesAcquisitions_195871" order="19" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueAcquisitions_b658ac" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueAcquisitions_b658ac" order="20" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesOther_dd3584" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesOther_dd3584" order="21" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueOther_87d18e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueOther_87d18e" order="22" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaapSharesIssued_1b8eb1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapSharesIssued_1b8eb1" order="23" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_c5b921" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c4b65" xlink:to="loc_us-gaapStockholdersEquity_c5b921" order="24" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConsolidatedStatementsOfCashFlows" xlink:title="170000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaapStatementOfCashFlowsAbstract_baed29" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesAbstract_07a7e7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesAbstract_07a7e7" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaapProfitLoss_71f08c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesAbstract_07a7e7" xlink:to="loc_us-gaapProfitLoss_71f08c" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaapAdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_dffe39" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesAbstract_07a7e7" xlink:to="loc_us-gaapAdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_dffe39" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaapDepreciationAndAmortization_007457" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_dffe39" xlink:to="loc_us-gaapDepreciationAndAmortization_007457" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAssetAmortizationExpense_789dde" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_dffe39" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAssetAmortizationExpense_789dde" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:label="loc_us-gaapEmployeeBenefitsAndShareBasedCompensation_958629" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapEmployeeBenefitsAndShareBasedCompensation_958629" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:label="loc_us-gaapIssuanceOfStockAndWarrantsForServicesOrClaims_dadc2e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapIssuanceOfStockAndWarrantsForServicesOrClaims_dadc2e" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived" xlink:label="loc_us-gaapImpairmentOfIntangibleAssetsFinitelived_346c47" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapImpairmentOfIntangibleAssetsFinitelived_346c47" order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaapDeferredIncomeTaxesAndTaxCredits_a97b80" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapDeferredIncomeTaxesAndTaxCredits_a97b80" order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaapDerivativeGainLossOnDerivativeNet_71ac90" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapDerivativeGainLossOnDerivativeNet_71ac90" order="10" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CryptoAssetRealizedGainLossNonoperating" xlink:label="loc_us-gaapCryptoAssetRealizedGainLossNonoperating_98d63e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapCryptoAssetRealizedGainLossNonoperating_98d63e" order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_GainLossOnChangeInFairValueOfConvertibleDebt" xlink:label="loc_classGainLossOnChangeInFairValueOfConvertibleDebt_99d119" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_classGainLossOnChangeInFairValueOfConvertibleDebt_99d119" order="12" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_IssuanceOfStocksForWaivingContractualRestrictionAmount" xlink:label="loc_classIssuanceOfStocksForWaivingContractualRestrictionAmount_7d0f30" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_classIssuanceOfStocksForWaivingContractualRestrictionAmount_7d0f30" order="13" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_StakingRewardsIncome" xlink:label="loc_classStakingRewardsIncome_cbc4a0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_classStakingRewardsIncome_cbc4a0" order="14" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" order="15" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_IncreaseDecreaseInDueFromRelatedParty" xlink:label="loc_classIncreaseDecreaseInDueFromRelatedParty_d06e9c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_classIncreaseDecreaseInDueFromRelatedParty_d06e9c" order="16" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_67a0cb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_67a0cb" order="17" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="loc_us-gaapIncreaseDecreaseInDepositOtherAssets_4733c6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInDepositOtherAssets_4733c6" order="18" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaapIncreaseDecreaseInAccountsPayable_ba3d59" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInAccountsPayable_ba3d59" order="19" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet" xlink:label="loc_us-gaapIncreaseDecreaseInInterestPayableNet_93f495" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInInterestPayableNet_93f495" order="20" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaapIncreaseDecreaseInDeferredRevenue_2f7e45" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInDeferredRevenue_2f7e45" order="21" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability" xlink:label="loc_us-gaapIncreaseDecreaseInOperatingLeaseLiability_a3172a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInOperatingLeaseLiability_a3172a" order="22" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_IncreaseDecreaseInDueToRelatedParty" xlink:label="loc_classIncreaseDecreaseInDueToRelatedParty_cea764" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_classIncreaseDecreaseInDueToRelatedParty_cea764" order="23" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapIncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities_1314cf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapIncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities_1314cf" order="24" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivities_9b00ab" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapIncreaseDecreaseInOperatingCapitalAbstract_4355f0" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivities_9b00ab" order="25" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" order="26" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaapPaymentsToAcquirePropertyPlantAndEquipment_ee13c0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" xlink:to="loc_us-gaapPaymentsToAcquirePropertyPlantAndEquipment_ee13c0" order="27" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentForAcquisitionCryptoAsset" xlink:label="loc_us-gaapPaymentForAcquisitionCryptoAsset_37da9a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" xlink:to="loc_us-gaapPaymentForAcquisitionCryptoAsset_37da9a" order="28" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaapPaymentsToAcquireIntangibleAssets_382952" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" xlink:to="loc_us-gaapPaymentsToAcquireIntangibleAssets_382952" order="29" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInInvestingActivities_d172dd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesAbstract_d5e574" xlink:to="loc_us-gaapNetCashProvidedByUsedInInvestingActivities_d172dd" order="30" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" order="31" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromConvertibleDebt" xlink:label="loc_us-gaapProceedsFromConvertibleDebt_023901" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_us-gaapProceedsFromConvertibleDebt_023901" order="32" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement" xlink:label="loc_us-gaapProceedsFromIssuanceOfPrivatePlacement_742a2a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_us-gaapProceedsFromIssuanceOfPrivatePlacement_742a2a" order="33" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ProceedsFromTheReverseRecapitalization" xlink:label="loc_classProceedsFromTheReverseRecapitalization_e28534" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_classProceedsFromTheReverseRecapitalization_e28534" order="34" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaapRepaymentsOfRelatedPartyDebt_2fafe4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_us-gaapRepaymentsOfRelatedPartyDebt_2fafe4" order="35" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromRelatedPartyDebt" xlink:label="loc_us-gaapProceedsFromRelatedPartyDebt_f421dd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_us-gaapProceedsFromRelatedPartyDebt_f421dd" order="36" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInFinancingActivities_d9ce95" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesAbstract_d0279e" xlink:to="loc_us-gaapNetCashProvidedByUsedInFinancingActivities_d9ce95" order="37" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_b27118" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_b27118" order="38" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f15074" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f15074" order="39" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1fb788" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1fb788" order="40" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaapSupplementalCashFlowInformationAbstract_3581ff" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapSupplementalCashFlowInformationAbstract_3581ff" order="41" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CashPaidDuringThePeriodAbstract" xlink:label="loc_classCashPaidDuringThePeriodAbstract_b31486" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSupplementalCashFlowInformationAbstract_3581ff" xlink:to="loc_classCashPaidDuringThePeriodAbstract_b31486" order="42" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaapInterestPaidNet_f252d0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classCashPaidDuringThePeriodAbstract_b31486" xlink:to="loc_us-gaapInterestPaidNet_f252d0" order="43" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaapIncomeTaxesPaidNet_23d2ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapIncomeTaxesPaidNet_23d2ed" order="44" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOfCashFlowsAbstract_baed29" xlink:to="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" order="45" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonStockAndWarrantsIssuedForIntangibleAssetsAcquisition" xlink:label="loc_classCommonStockAndWarrantsIssuedForIntangibleAssetsAcquisition_465fb1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classCommonStockAndWarrantsIssuedForIntangibleAssetsAcquisition_465fb1" order="46" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PurchaseOfCryptoAssetsThroughCovertibleDebt" xlink:label="loc_classPurchaseOfCryptoAssetsThroughCovertibleDebt_a966c9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classPurchaseOfCryptoAssetsThroughCovertibleDebt_a966c9" order="47" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonStockIssuedForLiabilityPayment" xlink:label="loc_classCommonStockIssuedForLiabilityPayment_77d09e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classCommonStockIssuedForLiabilityPayment_77d09e" order="48" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionOfConvertibleDebtAndInterestPayable" xlink:label="loc_classConversionOfConvertibleDebtAndInterestPayable_c05ff0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classConversionOfConvertibleDebtAndInterestPayable_c05ff0" order="49" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionOfConvertibleDebtToCommonStockAndSeriesCPreferredStock" xlink:label="loc_classConversionOfConvertibleDebtToCommonStockAndSeriesCPreferredStock_ec5666" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classConversionOfConvertibleDebtToCommonStockAndSeriesCPreferredStock_ec5666" order="50" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionOfPreferredStockToCommonStock" xlink:label="loc_classConversionOfPreferredStockToCommonStock_c86a63" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapNoncashInvestingAndFinancingItemsAbstract_67a511" xlink:to="loc_classConversionOfPreferredStockToCommonStock_c86a63" order="51" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/InsiderTradingArrangements" xlink:title="170001 - Disclosure - Insider Trading Arrangements">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InsiderTradingArragementsAbstract" xlink:label="loc_classInsiderTradingArragementsAbstract_3d5856" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTradingArrLineItems" xlink:label="loc_ecdInsiderTradingArrLineItems_cba5e1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrAdoptedFlag" xlink:label="loc_ecdRule10b51ArrAdoptedFlag_d92e62" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecdInsiderTradingArrLineItems_cba5e1" xlink:to="loc_ecdRule10b51ArrAdoptedFlag_d92e62" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrTrmntdFlag" xlink:label="loc_ecdRule10b51ArrTrmntdFlag_3afd1b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecdInsiderTradingArrLineItems_cba5e1" xlink:to="loc_ecdRule10b51ArrTrmntdFlag_3afd1b" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonRule10b51ArrAdoptedFlag" xlink:label="loc_ecdNonRule10b51ArrAdoptedFlag_580bd9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecdInsiderTradingArrLineItems_cba5e1" xlink:to="loc_ecdNonRule10b51ArrAdoptedFlag_580bd9" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonRule10b51ArrTrmntdFlag" xlink:label="loc_ecdNonRule10b51ArrTrmntdFlag_4de9e9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecdInsiderTradingArrLineItems_cba5e1" xlink:to="loc_ecdNonRule10b51ArrTrmntdFlag_4de9e9" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_MtrlTermsOfTrdArrTextBlock" xlink:label="loc_ecdMtrlTermsOfTrdArrTextBlock_09fb52" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecdInsiderTradingArrLineItems_cba5e1" xlink:to="loc_ecdMtrlTermsOfTrdArrTextBlock_09fb52" order="6" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentation" xlink:title="995551 - Disclosure - Description of the Business and Basis of Presentation">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DescriptionOfTheBusinessAndBasisOfPresentationAbstract" xlink:label="loc_classDescriptionOfTheBusinessAndBasisOfPresentationAbstract_76cec8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="loc_us-gaapBusinessDescriptionAndBasisOfPresentationTextBlock_6e1560" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classDescriptionOfTheBusinessAndBasisOfPresentationAbstract_76cec8" xlink:to="loc_us-gaapBusinessDescriptionAndBasisOfPresentationTextBlock_6e1560" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="995552 - Disclosure - Summary of Significant Accounting Policies">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaapAccountingPoliciesAbstract_f92d3b" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaapSignificantAccountingPoliciesTextBlock_a4d65b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_f92d3b" xlink:to="loc_us-gaapSignificantAccountingPoliciesTextBlock_a4d65b" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/PropertyAndEquipmentNet" xlink:title="995553 - Disclosure - Property and Equipment, net">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PropertyAndEquipmentAbstract" xlink:label="loc_classPropertyAndEquipmentAbstract_e1cbc8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaapPropertyPlantAndEquipmentDisclosureTextBlock_2e8ea3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classPropertyAndEquipmentAbstract_e1cbc8" xlink:to="loc_us-gaapPropertyPlantAndEquipmentDisclosureTextBlock_2e8ea3" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/InvestmentAccounts" xlink:title="995554 - Disclosure - Investment accounts">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InvestmentsAccountsAbstract" xlink:label="loc_classInvestmentsAccountsAbstract_aa123c" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTextBlock" xlink:label="loc_us-gaapInvestmentTextBlock_42a2e9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_aa123c" xlink:to="loc_us-gaapInvestmentTextBlock_42a2e9" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IntangibleAssets" xlink:title="995555 - Disclosure - Intangible Assets">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_b7fd45" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaapIntangibleAssetsDisclosureTextBlock_ba4104" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_b7fd45" xlink:to="loc_us-gaapIntangibleAssetsDisclosureTextBlock_ba4104" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/Leases" xlink:title="995556 - Disclosure - Leases">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaapLeasesAbstract_700e12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesOfLesseeDisclosureTextBlock" xlink:label="loc_us-gaapLeasesOfLesseeDisclosureTextBlock_3f2723" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_700e12" xlink:to="loc_us-gaapLeasesOfLesseeDisclosureTextBlock_3f2723" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/AccruedLiabilitiesAndOtherPayables" xlink:title="995557 - Disclosure - Accrued Liabilities and Other Payables">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_AccruedLiabilitiesAndOtherPayablesAbstract" xlink:label="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_6e6873" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" xlink:label="loc_us-gaapAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_254efa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_6e6873" xlink:to="loc_us-gaapAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_254efa" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxes" xlink:title="995558 - Disclosure - Income Taxes">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_04a568" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaapIncomeTaxDisclosureTextBlock_6cc547" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_04a568" xlink:to="loc_us-gaapIncomeTaxDisclosureTextBlock_6cc547" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedParties" xlink:title="995559 - Disclosure - Related parties">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_e23e19" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="loc_us-gaapRelatedPartyTransactionsDisclosureTextBlock_7c3be7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_e23e19" xlink:to="loc_us-gaapRelatedPartyTransactionsDisclosureTextBlock_7c3be7" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotes" xlink:title="995560 - Disclosure - Convertible notes">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_d6b70b" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaapDebtDisclosureTextBlock_ed1324" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_d6b70b" xlink:to="loc_us-gaapDebtDisclosureTextBlock_ed1324" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/WarrantLiabilities" xlink:title="995561 - Disclosure - Warrant Liabilities">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesAbstract" xlink:label="loc_classWarrantLiabilitiesAbstract_24cbb0" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesDisclosureTextBlock" xlink:label="loc_classWarrantLiabilitiesDisclosureTextBlock_06c8cd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_24cbb0" xlink:to="loc_classWarrantLiabilitiesDisclosureTextBlock_06c8cd" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RecurringFairValueMeasurements" xlink:title="995562 - Disclosure - Recurring fair value measurements">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RecurringFairValueMeasurementsAbstract" xlink:label="loc_classRecurringFairValueMeasurementsAbstract_a0dac4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RecurringFairValueMeasurementsDisclosureTextBlock" xlink:label="loc_classRecurringFairValueMeasurementsDisclosureTextBlock_98c6f4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classRecurringFairValueMeasurementsAbstract_a0dac4" xlink:to="loc_classRecurringFairValueMeasurementsDisclosureTextBlock_98c6f4" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SegmentInformationAndRevenueAnalysis" xlink:title="995563 - Disclosure - Segment information and revenue analysis">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SegmentInformationAndRevenueAnalysisAbstract" xlink:label="loc_classSegmentInformationAndRevenueAnalysisAbstract_a5b5f4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaapSegmentReportingDisclosureTextBlock_427fd0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classSegmentInformationAndRevenueAnalysisAbstract_a5b5f4" xlink:to="loc_us-gaapSegmentReportingDisclosureTextBlock_427fd0" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/CommitmentsAndContingencies" xlink:title="995564 - Disclosure - Commitments and Contingencies">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaapCommitmentsAndContingenciesDisclosureAbstract_8e5559" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaapCommitmentsAndContingenciesDisclosureTextBlock_74f783" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapCommitmentsAndContingenciesDisclosureAbstract_8e5559" xlink:to="loc_us-gaapCommitmentsAndContingenciesDisclosureTextBlock_74f783" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/Equity" xlink:title="995565 - Disclosure - Equity">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaapEquityAbstract_1c909b" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaapStockholdersEquityNoteDisclosureTextBlock_257b81" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityAbstract_1c909b" xlink:to="loc_us-gaapStockholdersEquityNoteDisclosureTextBlock_257b81" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConcentrationOfRisk" xlink:title="995566 - Disclosure - Concentration of risk">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConcentrationOfRiskAbstract" xlink:label="loc_classConcentrationOfRiskAbstract_c0ccd2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskDisclosureTextBlock" xlink:label="loc_us-gaapConcentrationRiskDisclosureTextBlock_e9e866" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConcentrationOfRiskAbstract_c0ccd2" xlink:to="loc_us-gaapConcentrationRiskDisclosureTextBlock_e9e866" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SubsequentEvent" xlink:title="995567 - Disclosure - Subsequent Event">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaapSubsequentEventsAbstract_86c447" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_us-gaapSubsequentEventsTextBlock_a7efae" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSubsequentEventsAbstract_86c447" xlink:to="loc_us-gaapSubsequentEventsTextBlock_a7efae" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:title="995568 - Disclosure - Summary of Significant Accounting Policies (Policies)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaapAccountingPoliciesAbstract_e46858" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaapBasisOfAccountingPolicyPolicyTextBlock_d048ca" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapBasisOfAccountingPolicyPolicyTextBlock_d048ca" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaapConsolidationPolicyTextBlock_a03d2f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapConsolidationPolicyTextBlock_a03d2f" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LiquidityAndGoingConcernPolicyPolicyTextBlock" xlink:label="loc_classLiquidityAndGoingConcernPolicyPolicyTextBlock_c90b62" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_classLiquidityAndGoingConcernPolicyPolicyTextBlock_c90b62" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaapUseOfEstimates_a6f137" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapUseOfEstimates_a6f137" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaapRevenueRecognitionPolicyTextBlock_cf9d1f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapRevenueRecognitionPolicyTextBlock_cf9d1f" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesPolicyTextBlock" xlink:label="loc_us-gaapCostOfSalesPolicyTextBlock_3f820c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapCostOfSalesPolicyTextBlock_3f820c" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ReferralIncentivesPolicyTextBlock" xlink:label="loc_classReferralIncentivesPolicyTextBlock_aade6d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_classReferralIncentivesPolicyTextBlock_aade6d" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaapCashAndCashEquivalentsPolicyTextBlock_b2e490" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapCashAndCashEquivalentsPolicyTextBlock_b2e490" order="8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositContractsPolicy" xlink:label="loc_us-gaapDepositContractsPolicy_41f401" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapDepositContractsPolicy_41f401" order="9" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaapPropertyPlantAndEquipmentPolicyTextBlock_1fd992" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapPropertyPlantAndEquipmentPolicyTextBlock_1fd992" order="10" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentPolicyTextBlock" xlink:label="loc_us-gaapInvestmentPolicyTextBlock_d75d38" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapInvestmentPolicyTextBlock_d75d38" order="11" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsFiniteLivedPolicy" xlink:label="loc_us-gaapIntangibleAssetsFiniteLivedPolicy_207897" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapIntangibleAssetsFiniteLivedPolicy_207897" order="12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaapIncomeTaxPolicyTextBlock_eec253" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapIncomeTaxPolicyTextBlock_eec253" order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaapFairValueOfFinancialInstrumentsPolicy_7f74ca" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapFairValueOfFinancialInstrumentsPolicy_7f74ca" order="14" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpensePolicy" xlink:label="loc_us-gaapResearchAndDevelopmentExpensePolicy_d9f68d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapResearchAndDevelopmentExpensePolicy_d9f68d" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="loc_us-gaapSegmentReportingPolicyPolicyTextBlock_ccaa21" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapSegmentReportingPolicyPolicyTextBlock_ccaa21" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingCostsPolicyTextBlock" xlink:label="loc_us-gaapAdvertisingCostsPolicyTextBlock_6239c1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapAdvertisingCostsPolicyTextBlock_6239c1" order="17" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingenciesPolicyTextBlock" xlink:label="loc_us-gaapCommitmentsAndContingenciesPolicyTextBlock_3bdc09" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapCommitmentsAndContingenciesPolicyTextBlock_3bdc09" order="18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeasesPolicyTextBlock" xlink:label="loc_us-gaapLesseeLeasesPolicyTextBlock_9beda8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapLesseeLeasesPolicyTextBlock_9beda8" order="19" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaapEarningsPerSharePolicyTextBlock_2aa3d5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapEarningsPerSharePolicyTextBlock_2aa3d5" order="20" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaapNewAccountingPronouncementsPolicyPolicyTextBlock_2b23f1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e46858" xlink:to="loc_us-gaapNewAccountingPronouncementsPolicyPolicyTextBlock_2b23f1" order="21" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:title="995569 - Disclosure - Summary of Significant Accounting Policies (Tables)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaapAccountingPoliciesAbstract_e4a110" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" xlink:label="loc_us-gaapScheduleOfCashAndCashEquivalentsTableTextBlock_ff76f3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_e4a110" xlink:to="loc_us-gaapScheduleOfCashAndCashEquivalentsTableTextBlock_ff76f3" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/PropertyAndEquipmentNetTables" xlink:title="995570 - Disclosure - Property and Equipment, net (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PropertyAndEquipmentAbstract" xlink:label="loc_classPropertyAndEquipmentAbstract_8057a7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTextBlock_9a25a9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classPropertyAndEquipmentAbstract_8057a7" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTextBlock_9a25a9" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/InvestmentAccountsTables" xlink:title="995571 - Disclosure - Investment accounts (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InvestmentsAccountsAbstract" xlink:label="loc_classInvestmentsAccountsAbstract_34b1f3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTableTextBlock" xlink:label="loc_us-gaapInvestmentTableTextBlock_dc467d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_34b1f3" xlink:to="loc_us-gaapInvestmentTableTextBlock_dc467d" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IntangibleAssetsTables" xlink:title="995572 - Disclosure - Intangible Assets (Tables)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_d70193" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="loc_us-gaapScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_e52ab9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_d70193" xlink:to="loc_us-gaapScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_e52ab9" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/LeasesTables" xlink:title="995573 - Disclosure - Leases (Tables)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaapLeasesAbstract_487fd7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityMaturityTableTextBlock_951894" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_487fd7" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityMaturityTableTextBlock_951894" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfFutureAmortizationOfTheRightOfUseAssetsTableTextBlock" xlink:label="loc_classScheduleOfFutureAmortizationOfTheRightOfUseAssetsTableTextBlock_8fdcce" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_487fd7" xlink:to="loc_classScheduleOfFutureAmortizationOfTheRightOfUseAssetsTableTextBlock_8fdcce" order="2" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/AccruedLiabilitiesAndOtherPayablesTables" xlink:title="995574 - Disclosure - Accrued Liabilities and Other Payables (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_AccruedLiabilitiesAndOtherPayablesAbstract" xlink:label="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_82afeb" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="loc_us-gaapScheduleOfAccruedLiabilitiesTableTextBlock_c7b96a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_82afeb" xlink:to="loc_us-gaapScheduleOfAccruedLiabilitiesTableTextBlock_c7b96a" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxesTables" xlink:title="995575 - Disclosure - Income Taxes (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_859e48" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaapScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_57c24b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_859e48" xlink:to="loc_us-gaapScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_57c24b" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="loc_us-gaapScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_79c887" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_859e48" xlink:to="loc_us-gaapScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_79c887" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="loc_us-gaapScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_77b3c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_859e48" xlink:to="loc_us-gaapScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_77b3c8" order="3" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedPartiesTables" xlink:title="995576 - Disclosure - Related parties (Tables)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfAffiliatesAndAffiliatedEntitiesTableTextBlock" xlink:label="loc_classScheduleOfAffiliatesAndAffiliatedEntitiesTableTextBlock_4a142c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" xlink:to="loc_classScheduleOfAffiliatesAndAffiliatedEntitiesTableTextBlock_4a142c" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfDueFromRelatedPartiesTableTextBlock" xlink:label="loc_classScheduleOfDueFromRelatedPartiesTableTextBlock_c48c74" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" xlink:to="loc_classScheduleOfDueFromRelatedPartiesTableTextBlock_c48c74" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfDueToRelatedPartiesTableTextBlock" xlink:label="loc_classScheduleOfDueToRelatedPartiesTableTextBlock_8cc43a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" xlink:to="loc_classScheduleOfDueToRelatedPartiesTableTextBlock_8cc43a" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:label="loc_us-gaapScheduleOfRelatedPartyTransactionsTableTextBlock_daabfb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" xlink:to="loc_us-gaapScheduleOfRelatedPartyTransactionsTableTextBlock_daabfb" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfRightOfUseAssetsAndOperatingLeaseLiabilitiesRecognizedFromRelatedPartyTableTextBlock" xlink:label="loc_classScheduleOfRightOfUseAssetsAndOperatingLeaseLiabilitiesRecognizedFromRelatedPartyTableTextBlock_a18218" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_c277bc" xlink:to="loc_classScheduleOfRightOfUseAssetsAndOperatingLeaseLiabilitiesRecognizedFromRelatedPartyTableTextBlock_a18218" order="5" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesTables" xlink:title="995577 - Disclosure - Convertible notes (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_68c53d" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtTableTextBlock" xlink:label="loc_us-gaapConvertibleDebtTableTextBlock_40273e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_68c53d" xlink:to="loc_us-gaapConvertibleDebtTableTextBlock_40273e" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfDescriptionOfConvertibleNotesTableTextBlock" xlink:label="loc_classScheduleOfDescriptionOfConvertibleNotesTableTextBlock_079396" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_68c53d" xlink:to="loc_classScheduleOfDescriptionOfConvertibleNotesTableTextBlock_079396" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAssumptionsUsedTableTextBlock" xlink:label="loc_us-gaapScheduleOfAssumptionsUsedTableTextBlock_d27781" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_68c53d" xlink:to="loc_us-gaapScheduleOfAssumptionsUsedTableTextBlock_d27781" order="3" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfChangesInTheFairValueOfConvertibleNotesTableTextBlock" xlink:label="loc_classScheduleOfChangesInTheFairValueOfConvertibleNotesTableTextBlock_2f571c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_68c53d" xlink:to="loc_classScheduleOfChangesInTheFairValueOfConvertibleNotesTableTextBlock_2f571c" order="4" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/WarrantLiabilitiesTables" xlink:title="995578 - Disclosure - Warrant Liabilities (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesAbstract" xlink:label="loc_classWarrantLiabilitiesAbstract_4b479e" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfWarrantLiabilitiesTableTextBlock" xlink:label="loc_classScheduleOfWarrantLiabilitiesTableTextBlock_6fe916" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_4b479e" xlink:to="loc_classScheduleOfWarrantLiabilitiesTableTextBlock_6fe916" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RecurringFairValueMeasurementsTables" xlink:title="995579 - Disclosure - Recurring fair value measurements (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RecurringFairValueMeasurementsAbstract" xlink:label="loc_classRecurringFairValueMeasurementsAbstract_1efbc4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaapScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_1087a9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classRecurringFairValueMeasurementsAbstract_1efbc4" xlink:to="loc_us-gaapScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_1087a9" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SegmentInformationAndRevenueAnalysisTables" xlink:title="995580 - Disclosure - Segment information and revenue analysis (Tables)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SegmentInformationAndRevenueAnalysisAbstract" xlink:label="loc_classSegmentInformationAndRevenueAnalysisAbstract_d30ebd" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="loc_us-gaapDisaggregationOfRevenueTableTextBlock_d2d3a7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classSegmentInformationAndRevenueAnalysisAbstract_d30ebd" xlink:to="loc_us-gaapDisaggregationOfRevenueTableTextBlock_d2d3a7" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/EquityTables" xlink:title="995581 - Disclosure - Equity (Tables)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaapEquityAbstract_6a391f" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ScheduleOfSharesIssuedTableTextBlock" xlink:label="loc_classScheduleOfSharesIssuedTableTextBlock_d9da0c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityAbstract_6a391f" xlink:to="loc_classScheduleOfSharesIssuedTableTextBlock_d9da0c" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentationDetailsNarrative" xlink:title="995582 - Disclosure - Description of the Business and Basis of Presentation (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DescriptionOfTheBusinessAndBasisOfPresentationAbstract" xlink:label="loc_classDescriptionOfTheBusinessAndBasisOfPresentationAbstract_060b79" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_f4e2c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classDescriptionOfTheBusinessAndBasisOfPresentationAbstract_060b79" xlink:to="loc_us-gaapStatementTable_f4e2c7" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_62807b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_f4e2c7" xlink:to="loc_us-gaapStatementLineItems_62807b" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis_ca0339" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_f4e2c7" xlink:to="loc_us-gaapBusinessAcquisitionAxis_ca0339" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_596cad" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAxis_ca0339" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_596cad" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassoverNJMember" xlink:label="loc_classClassoverNJMember_cdd4c4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_596cad" xlink:to="loc_classClassoverNJMember_cdd4c4" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_EquityMethodInvestmentsOwnershipPercentage" xlink:label="loc_classEquityMethodInvestmentsOwnershipPercentage_d46741" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_62807b" xlink:to="loc_classEquityMethodInvestmentsOwnershipPercentage_d46741" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="995583 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaapAccountingPoliciesAbstract_a752be" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Cash" xlink:label="loc_us-gaapCash_5f626d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_a752be" xlink:to="loc_us-gaapCash_5f626d" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Deposits" xlink:label="loc_us-gaapDeposits_09a502" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_a752be" xlink:to="loc_us-gaapDeposits_09a502" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_c513cc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_a752be" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_c513cc" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:title="995584 - Disclosure - Summary of Significant Accounting Policies (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaapAccountingPoliciesAbstract_65bf33" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_d36949" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_d36949" order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CurrentLiabilities" xlink:label="loc_classCurrentLiabilities_0e8e51" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classCurrentLiabilities_0e8e51" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WorkingCapitalDeficit" xlink:label="loc_classWorkingCapitalDeficit_1317fd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classWorkingCapitalDeficit_1317fd" order="3" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_StockholdersEquities" xlink:label="loc_classStockholdersEquities_171345" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classStockholdersEquities_171345" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NetIncomeAndLoss" xlink:label="loc_classNetIncomeAndLoss_8665cd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classNetIncomeAndLoss_8665cd" order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingExpense" xlink:label="loc_us-gaapAdvertisingExpense_55cf8f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_us-gaapAdvertisingExpense_55cf8f" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset_5672ff" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset_5672ff" order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedBorrowingInterestRate" xlink:label="loc_us-gaapSubordinatedBorrowingInterestRate_3764b6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_us-gaapSubordinatedBorrowingInterestRate_3764b6" order="8" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ProceedsFromBusinessCombinationTrustAccount" xlink:label="loc_classProceedsFromBusinessCombinationTrustAccount_6cb166" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classProceedsFromBusinessCombinationTrustAccount_6cb166" order="9" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_StockIssuedDuringThisPeriodValueNewIssues" xlink:label="loc_classStockIssuedDuringThisPeriodValueNewIssues_440f97" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classStockIssuedDuringThisPeriodValueNewIssues_440f97" order="10" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InitialClosingBalance" xlink:label="loc_classInitialClosingBalance_fd98c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAccountingPoliciesAbstract_65bf33" xlink:to="loc_classInitialClosingBalance_fd98c8" order="11" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/PropertyAndEquipmentNetDetails" xlink:title="995585 - Disclosure - Property and Equipment, net (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PropertyAndEquipmentAbstract" xlink:label="loc_classPropertyAndEquipmentAbstract_0b6ca2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_4287e6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classPropertyAndEquipmentAbstract_0b6ca2" xlink:to="loc_us-gaapStatementTable_4287e6" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_b45b95" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_4287e6" xlink:to="loc_us-gaapStatementLineItems_b45b95" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis_7546c9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_4287e6" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis_7546c9" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_59e15b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis_7546c9" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_59e15b" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaapComputerEquipmentMember_3e6063" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_59e15b" xlink:to="loc_us-gaapComputerEquipmentMember_3e6063" order="1021" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaapFurnitureAndFixturesMember_53be94" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_59e15b" xlink:to="loc_us-gaapFurnitureAndFixturesMember_53be94" order="1022" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaapLeaseholdImprovementsMember_e2df7d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_59e15b" xlink:to="loc_us-gaapLeaseholdImprovementsMember_e2df7d" order="1023" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaapPropertyPlantAndEquipmentGross_6454aa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_b45b95" xlink:to="loc_us-gaapPropertyPlantAndEquipmentGross_6454aa" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LessAccumulatedDepreciation" xlink:label="loc_classLessAccumulatedDepreciation_fb0d16" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_b45b95" xlink:to="loc_classLessAccumulatedDepreciation_fb0d16" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet_30edbd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classPropertyAndEquipmentAbstract_0b6ca2" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet_30edbd" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/PropertyAndEquipmentNetDetailsNarrative" xlink:title="995586 - Disclosure - Property and Equipment, net (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PropertyAndEquipmentAbstract" xlink:label="loc_classPropertyAndEquipmentAbstract_41cfa8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaapDepreciation_f77069" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classPropertyAndEquipmentAbstract_41cfa8" xlink:to="loc_us-gaapDepreciation_f77069" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/InvestmentAccountsDetails" xlink:title="995587 - Disclosure - Investment accounts (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InvestmentsAccountsAbstract" xlink:label="loc_classInvestmentsAccountsAbstract_a4cb94" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NumberOfSolanaPurchasedRestricted" xlink:label="loc_classNumberOfSolanaPurchasedRestricted_83e391" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_classNumberOfSolanaPurchasedRestricted_83e391" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NumberOfSolanaStakingRewards" xlink:label="loc_classNumberOfSolanaStakingRewards_5f0765" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_classNumberOfSolanaStakingRewards_5f0765" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NumberOfWorldcoinPurchased" xlink:label="loc_classNumberOfWorldcoinPurchased_bfa40d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_classNumberOfWorldcoinPurchased_bfa40d" order="3" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NumberOfWorldcoinStakingRewards" xlink:label="loc_classNumberOfWorldcoinStakingRewards_681bd7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_classNumberOfWorldcoinStakingRewards_681bd7" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CryptoAssetFairValueUnrestricted" xlink:label="loc_us-gaapCryptoAssetFairValueUnrestricted_6399f9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_us-gaapCryptoAssetFairValueUnrestricted_6399f9" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInterestEarningAssets" xlink:label="loc_us-gaapOtherInterestEarningAssets_5779f5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_us-gaapOtherInterestEarningAssets_5779f5" order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses" xlink:label="loc_us-gaapDeferredTaxAssetsUnrealizedCurrencyLosses_0e2d2e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_us-gaapDeferredTaxAssetsUnrealizedCurrencyLosses_0e2d2e" order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments" xlink:label="loc_us-gaapOtherInvestments_5f5c39" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_a4cb94" xlink:to="loc_us-gaapOtherInvestments_5f5c39" order="8" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/InvestmentAccountsDetailsNarrative" xlink:title="995588 - Disclosure - Investment accounts (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InvestmentsAccountsAbstract" xlink:label="loc_classInvestmentsAccountsAbstract_c450a9" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CryptoAssetFairValue" xlink:label="loc_us-gaapCryptoAssetFairValue_b2a07b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_c450a9" xlink:to="loc_us-gaapCryptoAssetFairValue_b2a07b" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsPercentageAssumedToNet" xlink:label="loc_us-gaapPremiumsPercentageAssumedToNet_1bfe4b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classInvestmentsAccountsAbstract_c450a9" xlink:to="loc_us-gaapPremiumsPercentageAssumedToNet_1bfe4b" order="2" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IntangibleAssetsDetails" xlink:title="995589 - Disclosure - Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_b54396" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_b54396" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearThree_bb686d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearThree_bb686d" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFour_943004" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFour_943004" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_2cb975" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_2cb975" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FiniteLivedIntangibleAssetsAmortizationExpense" xlink:label="loc_classFiniteLivedIntangibleAssetsAmortizationExpense_313537" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_5e1350" xlink:to="loc_classFiniteLivedIntangibleAssetsAmortizationExpense_313537" order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IntangibleAssetsDetailsNarrative" xlink:title="995590 - Disclosure - Intangible Assets (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_1bea4e" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_48473d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapGoodwillAndIntangibleAssetsDisclosureAbstract_1bea4e" xlink:to="loc_us-gaapStatementTable_48473d" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_815f9b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_48473d" xlink:to="loc_us-gaapStatementLineItems_815f9b" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_cd43bc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_48473d" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_cd43bc" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_09d382" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_cd43bc" xlink:to="loc_us-gaapRelatedPartyDomain_09d382" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis_580a38" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_48473d" xlink:to="loc_us-gaapPlanNameAxis_580a38" order="1040" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_747679" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameAxis_580a38" xlink:to="loc_us-gaapPlanNameDomain_747679" order="1040" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SilverRunGroupLLCMember" xlink:label="loc_classSilverRunGroupLLCMember_22e6c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyDomain_09d382" xlink:to="loc_classSilverRunGroupLLCMember_22e6c8" order="1041" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_BottomMember" xlink:label="loc_classBottomMember_a0dc07" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameDomain_747679" xlink:to="loc_classBottomMember_a0dc07" order="1042" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TopMember" xlink:label="loc_classTopMember_3b9d2c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameDomain_747679" xlink:to="loc_classTopMember_3b9d2c" order="1043" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfWhollyOwnedRealEstateInvestmentSubsidiaries" xlink:label="loc_us-gaapAssetsOfWhollyOwnedRealEstateInvestmentSubsidiaries_d84cd1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapAssetsOfWhollyOwnedRealEstateInvestmentSubsidiaries_d84cd1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionConsiderationTransferredOtherAssets" xlink:label="loc_us-gaapAssetAcquisitionConsiderationTransferredOtherAssets_2394b4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapAssetAcquisitionConsiderationTransferredOtherAssets_2394b4" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaapPaymentsToAcquireBusinessesGross_860084" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapPaymentsToAcquireBusinessesGross_860084" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaapCommonStockParOrStatedValuePerShare_910bd3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapCommonStockParOrStatedValuePerShare_910bd3" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseImpairmentLoss" xlink:label="loc_us-gaapFinanceLeaseImpairmentLoss_80b9f8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapFinanceLeaseImpairmentLoss_80b9f8" order="5" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantsToPurchaseSharesOfCommonStock" xlink:label="loc_classWarrantsToPurchaseSharesOfCommonStock_ea092f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_classWarrantsToPurchaseSharesOfCommonStock_ea092f" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantExercisePriceDecrease" xlink:label="loc_us-gaapWarrantExercisePriceDecrease_1df285" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapWarrantExercisePriceDecrease_1df285" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityOwnershipPercentage" xlink:label="loc_us-gaapVariableInterestEntityOwnershipPercentage_11c52b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapVariableInterestEntityOwnershipPercentage_11c52b" order="8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WorkersCompensationDiscountPercent" xlink:label="loc_us-gaapWorkersCompensationDiscountPercent_497793" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapWorkersCompensationDiscountPercent_497793" order="9" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ShareBasedGoodsAndNonemployeeServicesTransactionValuationsMethodExpectedTerm1" xlink:label="loc_classShareBasedGoodsAndNonemployeeServicesTransactionValuationsMethodExpectedTerm1_ac31e4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_classShareBasedGoodsAndNonemployeeServicesTransactionValuationsMethodExpectedTerm1_ac31e4" order="10" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued_7e3a5a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapCommonStockSharesIssued_7e3a5a" order="11" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue_7289f9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapCommonStockValue_7289f9" order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ExpectedVolatilityoflineofcreditfacility" xlink:label="loc_classExpectedVolatilityoflineofcreditfacility_dddf89" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_classExpectedVolatilityoflineofcreditfacility_dddf89" order="13" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RiskFreeInterestRate" xlink:label="loc_classRiskFreeInterestRate_f79811" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_classRiskFreeInterestRate_f79811" order="14" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DividendYield" xlink:label="loc_classDividendYield_c208ad" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_classDividendYield_c208ad" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebtExcludingAmortization" xlink:label="loc_us-gaapInterestExpenseDebtExcludingAmortization_cf030a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapInterestExpenseDebtExcludingAmortization_cf030a" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommunicationsAndInformationTechnology" xlink:label="loc_us-gaapCommunicationsAndInformationTechnology_428c19" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapCommunicationsAndInformationTechnology_428c19" order="17" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionRate" xlink:label="loc_us-gaapRelatedPartyTransactionRate_46f6de" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_815f9b" xlink:to="loc_us-gaapRelatedPartyTransactionRate_46f6de" order="18" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/LeasesDetails" xlink:title="995591 - Disclosure - Leases (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaapLeasesAbstract_6bb58d" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearTwo_42d999" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearTwo_42d999" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearThree_40be8f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearThree_40be8f" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFour_be8801" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFour_be8801" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_108a26" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_108a26" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LesseeOperatingFutureLeaseLiabilityPaymentsDue" xlink:label="loc_classLesseeOperatingFutureLeaseLiabilityPaymentsDue_624de6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_classLesseeOperatingFutureLeaseLiabilityPaymentsDue_624de6" order="5" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LessInterest" xlink:label="loc_classLessInterest_78c958" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_classLessInterest_78c958" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaapOperatingLeaseLiability_2441cf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_6bb58d" xlink:to="loc_us-gaapOperatingLeaseLiability_2441cf" order="7" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/LeasesDetails1" xlink:title="995592 - Disclosure - Leases (Details 1)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaapLeasesAbstract_e81bdb" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RightOfUseAssetsFutureAmortizationDueYearTwo" xlink:label="loc_classRightOfUseAssetsFutureAmortizationDueYearTwo_ae0cf5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_e81bdb" xlink:to="loc_classRightOfUseAssetsFutureAmortizationDueYearTwo_ae0cf5" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RightOfUseAssetsFutureAmortizationDueYearThree" xlink:label="loc_classRightOfUseAssetsFutureAmortizationDueYearThree_1b81a5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_e81bdb" xlink:to="loc_classRightOfUseAssetsFutureAmortizationDueYearThree_1b81a5" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RightOfUseAssetsFutureAmortizationDueYearFour" xlink:label="loc_classRightOfUseAssetsFutureAmortizationDueYearFour_2156db" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_e81bdb" xlink:to="loc_classRightOfUseAssetsFutureAmortizationDueYearFour_2156db" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RightOfUseAssetsFutureAmortizationDueRemainderOfFiscalYear" xlink:label="loc_classRightOfUseAssetsFutureAmortizationDueRemainderOfFiscalYear_5e557a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_e81bdb" xlink:to="loc_classRightOfUseAssetsFutureAmortizationDueRemainderOfFiscalYear_5e557a" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RightOfUseAssetsFutureAmortizationDue" xlink:label="loc_classRightOfUseAssetsFutureAmortizationDue_2b0fb0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_e81bdb" xlink:to="loc_classRightOfUseAssetsFutureAmortizationDue_2b0fb0" order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/LeasesDetailsNarrative" xlink:title="995593 - Disclosure - Leases (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaapLeasesAbstract_3f7e9f" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_78ca46" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLeasesAbstract_3f7e9f" xlink:to="loc_us-gaapStatementTable_78ca46" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_1c0a28" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_78ca46" xlink:to="loc_us-gaapStatementLineItems_1c0a28" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_8ea4a5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_78ca46" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_8ea4a5" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_aeb7e5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_8ea4a5" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_aeb7e5" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamGoMember" xlink:label="loc_classDreamGoMember_8a24c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_aeb7e5" xlink:to="loc_classDreamGoMember_8a24c7" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LeaseAndRentalExpenses" xlink:label="loc_classLeaseAndRentalExpenses_d433cd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c0a28" xlink:to="loc_classLeaseAndRentalExpenses_d433cd" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaapSubleaseIncome_3c742f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c0a28" xlink:to="loc_us-gaapSubleaseIncome_3c742f" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset_3bffea" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c0a28" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset_3bffea" order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding" xlink:label="loc_us-gaapDebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding_32299a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c0a28" xlink:to="loc_us-gaapDebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding_32299a" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LesseeOperatingLeaseRemainingLeaseTerms" xlink:label="loc_classLesseeOperatingLeaseRemainingLeaseTerms_cc5209" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1c0a28" xlink:to="loc_classLesseeOperatingLeaseRemainingLeaseTerms_cc5209" order="5" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/AccruedLiabilitiesAndOtherPayablesDetails" xlink:title="995594 - Disclosure - Accrued Liabilities and Other Payables (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_AccruedLiabilitiesAndOtherPayablesAbstract" xlink:label="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_63b7a1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_3424bd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classAccruedLiabilitiesAndOtherPayablesAbstract_63b7a1" xlink:to="loc_us-gaapStatementTable_3424bd" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_77a9da" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_3424bd" xlink:to="loc_us-gaapStatementLineItems_77a9da" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaapShortTermDebtTypeAxis_eba58e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_3424bd" xlink:to="loc_us-gaapShortTermDebtTypeAxis_eba58e" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain_56dc93" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeAxis_eba58e" xlink:to="loc_us-gaapShortTermDebtTypeDomain_56dc93" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CreditCardPayableMember" xlink:label="loc_classCreditCardPayableMember_278361" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeDomain_56dc93" xlink:to="loc_classCreditCardPayableMember_278361" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PayrollTaxPayableMember" xlink:label="loc_classPayrollTaxPayableMember_f8ec21" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeDomain_56dc93" xlink:to="loc_classPayrollTaxPayableMember_f8ec21" order="1022" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities_4ab0d8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_77a9da" xlink:to="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities_4ab0d8" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxesDetails" xlink:title="995595 - Disclosure - Income Taxes (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_b4e71a" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaapDeferredIncomeTaxExpenseBenefit_166df5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_b4e71a" xlink:to="loc_us-gaapDeferredIncomeTaxExpenseBenefit_166df5" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaapCurrentFederalTaxExpenseBenefit_117cf8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_b4e71a" xlink:to="loc_us-gaapCurrentFederalTaxExpenseBenefit_117cf8" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalIncomeTaxExpenseBenefit" xlink:label="loc_classTotalIncomeTaxExpenseBenefit_8020d2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_b4e71a" xlink:to="loc_classTotalIncomeTaxExpenseBenefit_8020d2" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxesDetails1" xlink:title="995596 - Disclosure - Income Taxes (Details 1)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_0258b7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaapOperatingLossCarryforwards_7aad78" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_us-gaapOperatingLossCarryforwards_7aad78" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalChangeInFairValueOfCryptoAssets" xlink:label="loc_classTotalChangeInFairValueOfCryptoAssets_19f837" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_classTotalChangeInFairValueOfCryptoAssets_19f837" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ChangeInFairValueOfConvertibleDebt" xlink:label="loc_classChangeInFairValueOfConvertibleDebt_71fb5a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_classChangeInFairValueOfConvertibleDebt_71fb5a" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmountOfImpairmentToCarryingAmountOfRegulatoryAssets" xlink:label="loc_us-gaapAmountOfImpairmentToCarryingAmountOfRegulatoryAssets_5564c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_us-gaapAmountOfImpairmentToCarryingAmountOfRegulatoryAssets_5564c7" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_OtherExpenseTemporaryDifference" xlink:label="loc_classOtherExpenseTemporaryDifference_b427bc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_classOtherExpenseTemporaryDifference_b427bc" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaapDeferredTaxAssetsNet_f390da" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_us-gaapDeferredTaxAssetsNet_f390da" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalDeferredTaxLiabilities" xlink:label="loc_classTotalDeferredTaxLiabilities_ebf44e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_classTotalDeferredTaxLiabilities_ebf44e" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaapDeferredTaxAssetsValuationAllowance_1f9ec9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_us-gaapDeferredTaxAssetsValuationAllowance_1f9ec9" order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaapDeferredTaxAssetsLiabilitiesNet_d8427b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_0258b7" xlink:to="loc_us-gaapDeferredTaxAssetsLiabilitiesNet_d8427b" order="9" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxesDetails2" xlink:title="995597 - Disclosure - Income Taxes (Details 2)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_ff1b62" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaapEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_907c76" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_ff1b62" xlink:to="loc_us-gaapEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_907c76" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense" xlink:label="loc_us-gaapEffectiveIncomeTaxRateReconciliationNondeductibleExpense_ad2911" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_ff1b62" xlink:to="loc_us-gaapEffectiveIncomeTaxRateReconciliationNondeductibleExpense_ad2911" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaapEffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_c75898" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_ff1b62" xlink:to="loc_us-gaapEffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_c75898" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaapEffectiveIncomeTaxRateContinuingOperations_91da10" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_ff1b62" xlink:to="loc_us-gaapEffectiveIncomeTaxRateContinuingOperations_91da10" order="4" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/IncomeTaxesDetailsNarrative" xlink:title="995598 - Disclosure - Income Taxes (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TaxesAbstract" xlink:label="loc_classTaxesAbstract_f49d08" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_8299a2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classTaxesAbstract_f49d08" xlink:to="loc_us-gaapStatementTable_8299a2" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_18fd30" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_8299a2" xlink:to="loc_us-gaapStatementLineItems_18fd30" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis_a8bd83" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_8299a2" xlink:to="loc_us-gaapBusinessAcquisitionAxis_a8bd83" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_1fe2be" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAxis_a8bd83" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_1fe2be" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassoverNJMember" xlink:label="loc_classClassoverNJMember_aa3ada" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_1fe2be" xlink:to="loc_classClassoverNJMember_aa3ada" order="1011" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassoverHoldingsIncMember" xlink:label="loc_classClassoverHoldingsIncMember_fdcd7e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_1fe2be" xlink:to="loc_classClassoverHoldingsIncMember_fdcd7e" order="1012" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit_9df4c4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_18fd30" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit_9df4c4" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FederalOperatingLossCarryforwardsNet" xlink:label="loc_classFederalOperatingLossCarryforwardsNet_630053" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_18fd30" xlink:to="loc_classFederalOperatingLossCarryforwardsNet_630053" order="2" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedPartiesDetails" xlink:title="995599 - Disclosure - Related parties (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_e9914e" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_446861" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_e9914e" xlink:to="loc_us-gaapStatementTable_446861" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_ba7817" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_446861" xlink:to="loc_us-gaapStatementLineItems_ba7817" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_aab6d2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_446861" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_aab6d2" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_689bf4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_aab6d2" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_689bf4" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamLegalGroupIncMember" xlink:label="loc_classDreamLegalGroupIncMember_53c2d0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_689bf4" xlink:to="loc_classDreamLegalGroupIncMember_53c2d0" order="1011" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DueFromRelatedPartyTransactionAmountsOfTransaction" xlink:label="loc_classDueFromRelatedPartyTransactionAmountsOfTransaction_b51c15" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ba7817" xlink:to="loc_classDueFromRelatedPartyTransactionAmountsOfTransaction_b51c15" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedPartiesDetails1" xlink:title="995600 - Disclosure - Related parties (Details 1)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_1152f1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_862932" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_1152f1" xlink:to="loc_us-gaapStatementTable_862932" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_b7c205" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_862932" xlink:to="loc_us-gaapStatementLineItems_b7c205" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_2299c0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_862932" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_2299c0" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_bdf86e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_2299c0" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_bdf86e" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis_3636f5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_862932" xlink:to="loc_us-gaapAwardDateAxis_3636f5" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_1a8601" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateAxis_3636f5" xlink:to="loc_us-gaapAwardDateDomain_1a8601" order="1030" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LuoHuiMember" xlink:label="loc_classLuoHuiMember_bdb820" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_bdf86e" xlink:to="loc_classLuoHuiMember_bdb820" order="1031" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_AugustFifteenTwentyTwentyFiveMember" xlink:label="loc_classAugustFifteenTwentyTwentyFiveMember_52edac" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateDomain_1a8601" xlink:to="loc_classAugustFifteenTwentyTwentyFiveMember_52edac" order="1032" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamGoIncMember" xlink:label="loc_classDreamGoIncMember_dbb4e7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_bdf86e" xlink:to="loc_classDreamGoIncMember_dbb4e7" order="1033" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DueToRelatedPartyTransactionAmountsOfTransaction" xlink:label="loc_classDueToRelatedPartyTransactionAmountsOfTransaction_9d1385" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_b7c205" xlink:to="loc_classDueToRelatedPartyTransactionAmountsOfTransaction_9d1385" order="1" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedPartiesDetails2" xlink:title="995601 - Disclosure - Related parties (Details 2)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_0e92e1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_2b4ff8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_0e92e1" xlink:to="loc_us-gaapStatementTable_2b4ff8" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_921f7b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_2b4ff8" xlink:to="loc_us-gaapStatementLineItems_921f7b" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_431c80" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_2b4ff8" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_431c80" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_431c80" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamLegalGroupIncMember" xlink:label="loc_classDreamLegalGroupIncMember_a371f8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" xlink:to="loc_classDreamLegalGroupIncMember_a371f8" order="1011" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LuoHuiMember" xlink:label="loc_classLuoHuiMember_0a23f9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" xlink:to="loc_classLuoHuiMember_0a23f9" order="1012" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamGoIncMember" xlink:label="loc_classDreamGoIncMember_b31817" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" xlink:to="loc_classDreamGoIncMember_b31817" order="1013" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_YiLiuMember" xlink:label="loc_classYiLiuMember_057b75" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" xlink:to="loc_classYiLiuMember_057b75" order="1014" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_GeniusKidClassLLCMember" xlink:label="loc_classGeniusKidClassLLCMember_fbe8bc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_7b5d6f" xlink:to="loc_classGeniusKidClassLLCMember_fbe8bc" order="1015" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RelatedPartyTransactions" xlink:label="loc_classRelatedPartyTransactions_41db08" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_921f7b" xlink:to="loc_classRelatedPartyTransactions_41db08" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RelatedPartyTransactionAmountsOfTransactionRentExpense" xlink:label="loc_classRelatedPartyTransactionAmountsOfTransactionRentExpense_7c0119" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_921f7b" xlink:to="loc_classRelatedPartyTransactionAmountsOfTransactionRentExpense_7c0119" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RelatedPartyTransactionAmountsOfTransactionInterestExpense" xlink:label="loc_classRelatedPartyTransactionAmountsOfTransactionInterestExpense_f8afd6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_921f7b" xlink:to="loc_classRelatedPartyTransactionAmountsOfTransactionInterestExpense_f8afd6" order="3" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RelatedPartyTransactionAmountsOfTransactionSubleaseIncome" xlink:label="loc_classRelatedPartyTransactionAmountsOfTransactionSubleaseIncome_ec0fcc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_921f7b" xlink:to="loc_classRelatedPartyTransactionAmountsOfTransactionSubleaseIncome_ec0fcc" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RelatedPartyTransactionAmountsOfTransactionConsultingRevenue" xlink:label="loc_classRelatedPartyTransactionAmountsOfTransactionConsultingRevenue_1be7ee" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_921f7b" xlink:to="loc_classRelatedPartyTransactionAmountsOfTransactionConsultingRevenue_1be7ee" order="5" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RelatedPartiesDetails3" xlink:title="995602 - Disclosure - Related parties (Details 3)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaapRelatedPartyTransactionsAbstract_b78cea" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_733e54" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsAbstract_b78cea" xlink:to="loc_us-gaapStatementTable_733e54" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_ca39fe" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_733e54" xlink:to="loc_us-gaapStatementLineItems_ca39fe" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_568909" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_733e54" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_568909" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_ec1c4d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_568909" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_ec1c4d" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DreamGoIncMember" xlink:label="loc_classDreamGoIncMember_844eb9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_ec1c4d" xlink:to="loc_classDreamGoIncMember_844eb9" order="1011" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset_55ba0b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ca39fe" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset_55ba0b" order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ShortTermObligationUnderOperatingLeases" xlink:label="loc_classShortTermObligationUnderOperatingLeases_a9c86e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ca39fe" xlink:to="loc_classShortTermObligationUnderOperatingLeases_a9c86e" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaapLongTermDebtAndCapitalLeaseObligations_22a488" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ca39fe" xlink:to="loc_us-gaapLongTermDebtAndCapitalLeaseObligations_22a488" order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesPayableDetails" xlink:title="995603 - Disclosure - Convertible Notes Payable (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_368636" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_3c4823" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_368636" xlink:to="loc_us-gaapStatementTable_3c4823" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_183dfa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_3c4823" xlink:to="loc_us-gaapStatementLineItems_183dfa" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaapDebtInstrumentAxis_b97ed0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_3c4823" xlink:to="loc_us-gaapDebtInstrumentAxis_b97ed0" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentAxis_b97ed0" xlink:to="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableOneMember" xlink:label="loc_classConvertibleNotesPayableOneMember_577964" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableOneMember_577964" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwoMember" xlink:label="loc_classConvertibleNotesPayableTwoMember_430565" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwoMember_430565" order="1022" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableThreeMember" xlink:label="loc_classConvertibleNotesPayableThreeMember_02006d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableThreeMember_02006d" order="1023" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableFourMember" xlink:label="loc_classConvertibleNotesPayableFourMember_30c245" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableFourMember_30c245" order="1024" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableFiveMember" xlink:label="loc_classConvertibleNotesPayableFiveMember_8ecb2c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableFiveMember_8ecb2c" order="1025" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableSixMember" xlink:label="loc_classConvertibleNotesPayableSixMember_8e6688" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableSixMember_8e6688" order="1026" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableSevenMember" xlink:label="loc_classConvertibleNotesPayableSevenMember_ce6955" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableSevenMember_ce6955" order="1027" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableEightMember" xlink:label="loc_classConvertibleNotesPayableEightMember_6adfd1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableEightMember_6adfd1" order="1028" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableNineMember" xlink:label="loc_classConvertibleNotesPayableNineMember_5d5ca1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableNineMember_5d5ca1" order="1029" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTenMember" xlink:label="loc_classConvertibleNotesPayableTenMember_03739f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTenMember_03739f" order="1030" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableThirteenMember" xlink:label="loc_classConvertibleNotesPayableThirteenMember_0795a6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableThirteenMember_0795a6" order="1031" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwelveMember" xlink:label="loc_classConvertibleNotesPayableTwelveMember_99d0bf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwelveMember_99d0bf" order="1032" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableElevenMember" xlink:label="loc_classConvertibleNotesPayableElevenMember_23692f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableElevenMember_23692f" order="1033" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableFourteenMember" xlink:label="loc_classConvertibleNotesPayableFourteenMember_5e32a7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableFourteenMember_5e32a7" order="1034" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableFifteenMember" xlink:label="loc_classConvertibleNotesPayableFifteenMember_2e6b0d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableFifteenMember_2e6b0d" order="1035" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableSixteenMember" xlink:label="loc_classConvertibleNotesPayableSixteenMember_ce3a34" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableSixteenMember_ce3a34" order="1036" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableSeventeenMember" xlink:label="loc_classConvertibleNotesPayableSeventeenMember_324987" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableSeventeenMember_324987" order="1037" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableEighteenMember" xlink:label="loc_classConvertibleNotesPayableEighteenMember_242994" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableEighteenMember_242994" order="1038" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableNinteenMember" xlink:label="loc_classConvertibleNotesPayableNinteenMember_b47bf8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableNinteenMember_b47bf8" order="1039" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyMember" xlink:label="loc_classConvertibleNotesPayableTwentyMember_fbc32a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyMember_fbc32a" order="1040" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyOneMember" xlink:label="loc_classConvertibleNotesPayableTwentyOneMember_f28012" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyOneMember_f28012" order="1041" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyTwoMember" xlink:label="loc_classConvertibleNotesPayableTwentyTwoMember_b3c2a3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyTwoMember_b3c2a3" order="1042" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyThreeMember" xlink:label="loc_classConvertibleNotesPayableTwentyThreeMember_4189e8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyThreeMember_4189e8" order="1043" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyFourMember" xlink:label="loc_classConvertibleNotesPayableTwentyFourMember_2d7949" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyFourMember_2d7949" order="1044" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentyFiveMember" xlink:label="loc_classConvertibleNotesPayableTwentyFiveMember_0a0618" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentyFiveMember_0a0618" order="1045" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentySixMember" xlink:label="loc_classConvertibleNotesPayableTwentySixMember_c086c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentySixMember_c086c8" order="1046" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesPayableTwentySevenMember" xlink:label="loc_classConvertibleNotesPayableTwentySevenMember_61dae0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain_f6b0bd" xlink:to="loc_classConvertibleNotesPayableTwentySevenMember_61dae0" order="1047" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleNotesPayable" xlink:label="loc_us-gaapConvertibleNotesPayable_91745d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_us-gaapConvertibleNotesPayable_91745d" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaapDebtInstrumentInterestRateDuringPeriod_5c71a1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_us-gaapDebtInstrumentInterestRateDuringPeriod_5c71a1" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="loc_us-gaapDebtConversionConvertedInstrumentAmount1_d48296" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_us-gaapDebtConversionConvertedInstrumentAmount1_d48296" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaapDebtInstrumentMaturityDate_d87b01" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_us-gaapDebtInstrumentMaturityDate_d87b01" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DebtInstrumentClosingDate" xlink:label="loc_classDebtInstrumentClosingDate_90b568" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_classDebtInstrumentClosingDate_90b568" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleLongTermNotesPayable" xlink:label="loc_us-gaapConvertibleLongTermNotesPayable_98ffc5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_183dfa" xlink:to="loc_us-gaapConvertibleLongTermNotesPayable_98ffc5" order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesPayableDetails1" xlink:title="995604 - Disclosure - Convertible Notes Payable (Details 1)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_5bbb8e" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentIssuanceDate1" xlink:label="loc_us-gaapDebtInstrumentIssuanceDate1_bb9fff" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_us-gaapDebtInstrumentIssuanceDate1_bb9fff" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaapDebtInstrumentFaceAmount_10cfa4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_us-gaapDebtInstrumentFaceAmount_10cfa4" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaapDebtInstrumentMaturityDate_1b0965" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_us-gaapDebtInstrumentMaturityDate_1b0965" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaapDebtInstrumentInterestRateDuringPeriod_568369" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_us-gaapDebtInstrumentInterestRateDuringPeriod_568369" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaapDebtInstrumentConvertibleConversionPrice1_9711bb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_us-gaapDebtInstrumentConvertibleConversionPrice1_9711bb" order="5" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleDebtFloorPricePerShare" xlink:label="loc_classConvertibleDebtFloorPricePerShare_c1c735" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_classConvertibleDebtFloorPricePerShare_c1c735" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DebtInstrumentRedemptionTerms" xlink:label="loc_classDebtInstrumentRedemptionTerms_75432c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_classDebtInstrumentRedemptionTerms_75432c" order="7" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_UseOfProceeds" xlink:label="loc_classUseOfProceeds_ccafd0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_5bbb8e" xlink:to="loc_classUseOfProceeds_ccafd0" order="8" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesPayableDetails2" xlink:title="995605 - Disclosure - Convertible Notes Payable (Details 2)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_41fd74" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_d831b1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_41fd74" xlink:to="loc_us-gaapStatementTable_d831b1" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_9c4697" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_d831b1" xlink:to="loc_us-gaapStatementLineItems_9c4697" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_e711a4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_d831b1" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_e711a4" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_ceb07c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_e711a4" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_ceb07c" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_8d1cf8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_ceb07c" xlink:to="loc_us-gaapFairValueInputsLevel3Member_8d1cf8" order="1021" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaapDebtInstrumentFaceAmount_f963a4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapDebtInstrumentFaceAmount_f963a4" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaapDebtInstrumentFairValue_ad1fca" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapDebtInstrumentFairValue_ad1fca" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeVolatilityRate" xlink:label="loc_us-gaapLongDurationContractsAssumptionsByProductAndGuaranteeVolatilityRate_9937e9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapLongDurationContractsAssumptionsByProductAndGuaranteeVolatilityRate_9937e9" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFloorInterestRate" xlink:label="loc_us-gaapDerivativeFloorInterestRate_7623f5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapDerivativeFloorInterestRate_7623f5" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTermOfContract" xlink:label="loc_us-gaapDerivativeTermOfContract_4bce06" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapDerivativeTermOfContract_4bce06" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentInterestRatePaidInKind" xlink:label="loc_us-gaapInvestmentInterestRatePaidInKind_c9c70c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapInvestmentInterestRatePaidInKind_c9c70c" order="6" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaapSaleOfStockPricePerShare_754e9c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapSaleOfStockPricePerShare_754e9c" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaapDebtInstrumentConvertibleConversionPrice1_427052" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_us-gaapDebtInstrumentConvertibleConversionPrice1_427052" order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RedemptionPremiumPercent" xlink:label="loc_classRedemptionPremiumPercent_72d5c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_9c4697" xlink:to="loc_classRedemptionPremiumPercent_72d5c7" order="9" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesPayableDetails3" xlink:title="995606 - Disclosure - Convertible Notes Payable (Details 3)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_7b184a" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_e2a18f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_7b184a" xlink:to="loc_us-gaapStatementTable_e2a18f" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_ab07f1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_e2a18f" xlink:to="loc_us-gaapStatementLineItems_ab07f1" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_310f7b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_e2a18f" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_310f7b" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_2c88d3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_310f7b" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_2c88d3" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_80f838" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_2c88d3" xlink:to="loc_us-gaapFairValueInputsLevel3Member_80f838" order="1011" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaapLongTermDebtFairValue_2d92ba" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ab07f1" xlink:to="loc_us-gaapLongTermDebtFairValue_2d92ba" order="1" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_InitialRecognitionAtPrincipalAmount" xlink:label="loc_classInitialRecognitionAtPrincipalAmount_083daf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ab07f1" xlink:to="loc_classInitialRecognitionAtPrincipalAmount_083daf" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings" xlink:label="loc_us-gaapGainLossOnFairValueHedgesRecognizedInEarnings_70e78d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ab07f1" xlink:to="loc_us-gaapGainLossOnFairValueHedgesRecognizedInEarnings_70e78d" order="3" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertiblePreferredDividendsNetOfTax" xlink:label="loc_us-gaapConvertiblePreferredDividendsNetOfTax_8bd1f8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ab07f1" xlink:to="loc_us-gaapConvertiblePreferredDividendsNetOfTax_8bd1f8" order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LongTermDebtFairValues" xlink:label="loc_classLongTermDebtFairValues_aa963a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_ab07f1" xlink:to="loc_classLongTermDebtFairValues_aa963a" order="5" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConvertibleNotesPayableDetailsNarrative" xlink:title="995607 - Disclosure - Convertible Notes Payable (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNotesAbstract" xlink:label="loc_classConvertibleNotesAbstract_30fad4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_a90259" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConvertibleNotesAbstract_30fad4" xlink:to="loc_us-gaapStatementTable_a90259" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_f5a8f5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_a90259" xlink:to="loc_us-gaapStatementLineItems_f5a8f5" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_c2b39b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_a90259" xlink:to="loc_us-gaapStatementClassOfStockAxis_c2b39b" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_f06995" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_c2b39b" xlink:to="loc_us-gaapClassOfStockDomain_f06995" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_b52b19" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_f06995" xlink:to="loc_us-gaapCommonClassBMember_b52b19" order="1011" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesCPreferredStockMember" xlink:label="loc_us-gaapSeriesCPreferredStockMember_9d3074" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_f06995" xlink:to="loc_us-gaapSeriesCPreferredStockMember_9d3074" order="1012" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal" xlink:label="loc_us-gaapDebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal_baa1c2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapDebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal_baa1c2" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaapProceedsFromIssuanceOfLongTermDebt_6db465" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapProceedsFromIssuanceOfLongTermDebt_6db465" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaapDebtInstrumentBasisSpreadOnVariableRate1_ea6bc3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapDebtInstrumentBasisSpreadOnVariableRate1_ea6bc3" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractualObligation" xlink:label="loc_us-gaapContractualObligation_af18d6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapContractualObligation_af18d6" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleLongTermNotesPayable" xlink:label="loc_us-gaapConvertibleLongTermNotesPayable_23c4c9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapConvertibleLongTermNotesPayable_23c4c9" order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionPriceFloor" xlink:label="loc_classConversionPriceFloor_d2fb90" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classConversionPriceFloor_d2fb90" order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LowerConversionPricePercent" xlink:label="loc_classLowerConversionPricePercent_79f9fb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classLowerConversionPricePercent_79f9fb" order="7" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_IncreaseInExpectedVolatility" xlink:label="loc_classIncreaseInExpectedVolatility_aa3a2c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classIncreaseInExpectedVolatility_aa3a2c" order="8" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DecreaseInExpectedVolatility" xlink:label="loc_classDecreaseInExpectedVolatility_a60f0f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classDecreaseInExpectedVolatility_a60f0f" order="9" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FairValueIncrease" xlink:label="loc_classFairValueIncrease_41acc0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classFairValueIncrease_41acc0" order="10" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FairValueDecrease" xlink:label="loc_classFairValueDecrease_3da32c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classFairValueDecrease_3da32c" order="11" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaapInterestPayableCurrent_8eaadf" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapInterestPayableCurrent_8eaadf" order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaapDebtInstrumentFaceAmount_5b93a3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapDebtInstrumentFaceAmount_5b93a3" order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionOfStockSharesIssuedOne" xlink:label="loc_classConversionOfStockSharesIssuedOne_138916" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classConversionOfStockSharesIssuedOne_138916" order="14" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConversionInClassBCommonShares" xlink:label="loc_classConversionInClassBCommonShares_7241bd" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_classConversionInClassBCommonShares_7241bd" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockAmountIssued1" xlink:label="loc_us-gaapConversionOfStockAmountIssued1_e0655b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapConversionOfStockAmountIssued1_e0655b" order="16" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="loc_us-gaapConversionOfStockSharesConverted1_cf3225" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapConversionOfStockSharesConverted1_cf3225" order="17" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockSplits" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesStockSplits_919d9e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesStockSplits_919d9e" order="18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_be364b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_f5a8f5" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_be364b" order="19" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/WarrantLiabilitiesDetails" xlink:title="995608 - Disclosure - Warrant Liabilities (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesAbstract" xlink:label="loc_classWarrantLiabilitiesAbstract_3a842f" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiability" xlink:label="loc_classWarrantLiability_bf9308" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_3a842f" xlink:to="loc_classWarrantLiability_bf9308" order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ChangeInFairValueOfWarrantLiability" xlink:label="loc_classChangeInFairValueOfWarrantLiability_7b36ae" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_3a842f" xlink:to="loc_classChangeInFairValueOfWarrantLiability_7b36ae" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiability" xlink:label="loc_classWarrantLiability_221f03" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_3a842f" xlink:to="loc_classWarrantLiability_221f03" order="3" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/WarrantLiabilitiesDetailsNarrative" xlink:title="995609 - Disclosure - Warrant Liabilities (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesAbstract" xlink:label="loc_classWarrantLiabilitiesAbstract_5c2b18" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_4d57b2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classWarrantLiabilitiesAbstract_5c2b18" xlink:to="loc_us-gaapStatementTable_4d57b2" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_1b32aa" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_4d57b2" xlink:to="loc_us-gaapStatementLineItems_1b32aa" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis_1d8094" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_4d57b2" xlink:to="loc_us-gaapAwardDateAxis_1d8094" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_0f9d34" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateAxis_1d8094" xlink:to="loc_us-gaapAwardDateDomain_0f9d34" order="1010" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_MarchThirtyOneTwentyTwentySixMember" xlink:label="loc_classMarchThirtyOneTwentyTwentySixMember_822146" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateDomain_0f9d34" xlink:to="loc_classMarchThirtyOneTwentyTwentySixMember_822146" order="1011" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="loc_us-gaapClassOfWarrantOrRightOutstanding_c21634" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_us-gaapClassOfWarrantOrRightOutstanding_c21634" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_3baff2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_3baff2" order="2" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassOfWarrantOrRightRedemptionPrice" xlink:label="loc_classClassOfWarrantOrRightRedemptionPrice_ec708b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classClassOfWarrantOrRightRedemptionPrice_ec708b" order="3" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantIssued" xlink:label="loc_classWarrantIssued_5998e3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classWarrantIssued_5998e3" order="4" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LastSalePriceOfOrdinaryShares" xlink:label="loc_classLastSalePriceOfOrdinaryShares_4654b2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classLastSalePriceOfOrdinaryShares_4654b2" order="5" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_NewlyIssuedPrice" xlink:label="loc_classNewlyIssuedPrice_e7a98d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classNewlyIssuedPrice_e7a98d" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PercentOfAggregateGrossProceedsFromIssuances" xlink:label="loc_classPercentOfAggregateGrossProceedsFromIssuances_98aa8b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classPercentOfAggregateGrossProceedsFromIssuances_98aa8b" order="7" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantAdjustedPercentage" xlink:label="loc_classWarrantAdjustedPercentage_fff6d4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_1b32aa" xlink:to="loc_classWarrantAdjustedPercentage_fff6d4" order="8" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/RecurringFairValueMeasurementsDetails" xlink:title="995610 - Disclosure - Recurring fair value measurements (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RecurringFairValueMeasurementsAbstract" xlink:label="loc_classRecurringFairValueMeasurementsAbstract_b0fd99" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_013cd7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classRecurringFairValueMeasurementsAbstract_b0fd99" xlink:to="loc_us-gaapStatementTable_013cd7" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_aa5ea0" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_013cd7" xlink:to="loc_us-gaapStatementLineItems_aa5ea0" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_50c4ad" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_013cd7" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_50c4ad" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_5d2703" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis_50c4ad" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_5d2703" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis_c01f92" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_013cd7" xlink:to="loc_us-gaapPlanNameAxis_c01f92" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_cb0a8f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameAxis_c01f92" xlink:to="loc_us-gaapPlanNameDomain_cb0a8f" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaapShortTermDebtTypeAxis_31d600" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_013cd7" xlink:to="loc_us-gaapShortTermDebtTypeAxis_31d600" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain_600649" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeAxis_31d600" xlink:to="loc_us-gaapShortTermDebtTypeDomain_600649" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaapFairValueInputsLevel1Member_1cc1bc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_5d2703" xlink:to="loc_us-gaapFairValueInputsLevel1Member_1cc1bc" order="1031" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CryptoAssetMember" xlink:label="loc_classCryptoAssetMember_06c82c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameDomain_cb0a8f" xlink:to="loc_classCryptoAssetMember_06c82c" order="1032" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaapFairValueInputsLevel2Member_a1f661" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_5d2703" xlink:to="loc_us-gaapFairValueInputsLevel2Member_a1f661" order="1033" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_c15143" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_5d2703" xlink:to="loc_us-gaapFairValueInputsLevel3Member_c15143" order="1034" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleNotesPayableMember" xlink:label="loc_us-gaapConvertibleNotesPayableMember_c8d7c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeDomain_600649" xlink:to="loc_us-gaapConvertibleNotesPayableMember_c8d7c7" order="1035" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantLiabilitiesMember" xlink:label="loc_classWarrantLiabilitiesMember_bb2fe9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapShortTermDebtTypeDomain_600649" xlink:to="loc_classWarrantLiabilitiesMember_bb2fe9" order="1036" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaapAssetsFairValueDisclosure_d131ec" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_aa5ea0" xlink:to="loc_us-gaapAssetsFairValueDisclosure_d131ec" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaapLiabilitiesFairValueDisclosure_fb37e5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_aa5ea0" xlink:to="loc_us-gaapLiabilitiesFairValueDisclosure_fb37e5" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SegmentInformationAndRevenueAnalysisDetails" xlink:title="995611 - Disclosure - Segment information and revenue analysis (Details)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SegmentInformationAndRevenueAnalysisAbstract" xlink:label="loc_classSegmentInformationAndRevenueAnalysisAbstract_678616" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_0f8021" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classSegmentInformationAndRevenueAnalysisAbstract_678616" xlink:to="loc_us-gaapStatementTable_0f8021" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_905e20" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_0f8021" xlink:to="loc_us-gaapStatementLineItems_905e20" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis" xlink:label="loc_us-gaapStatementOperatingActivitiesSegmentAxis_9793eb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_0f8021" xlink:to="loc_us-gaapStatementOperatingActivitiesSegmentAxis_9793eb" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentOperatingActivitiesDomain" xlink:label="loc_us-gaapSegmentOperatingActivitiesDomain_de7b78" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementOperatingActivitiesSegmentAxis_9793eb" xlink:to="loc_us-gaapSegmentOperatingActivitiesDomain_de7b78" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TimeBasedSubscriptionsMember" xlink:label="loc_classTimeBasedSubscriptionsMember_fce5cb" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSegmentOperatingActivitiesDomain_de7b78" xlink:to="loc_classTimeBasedSubscriptionsMember_fce5cb" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CreditBasedSubscriptionsMember" xlink:label="loc_classCreditBasedSubscriptionsMember_a9690d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSegmentOperatingActivitiesDomain_de7b78" xlink:to="loc_classCreditBasedSubscriptionsMember_a9690d" order="1022" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_MarketingRevenuesRelatedPartyMember" xlink:label="loc_classMarketingRevenuesRelatedPartyMember_7282ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSegmentOperatingActivitiesDomain_de7b78" xlink:to="loc_classMarketingRevenuesRelatedPartyMember_7282ed" order="1023" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues" xlink:label="loc_us-gaapRevenues_96ca04" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_905e20" xlink:to="loc_us-gaapRevenues_96ca04" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/EquityDetails" xlink:title="995612 - Disclosure - Equity (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaapEquityAbstract_28cc37" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_a7ca35" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityAbstract_28cc37" xlink:to="loc_us-gaapStatementTable_a7ca35" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_6e441a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_a7ca35" xlink:to="loc_us-gaapStatementLineItems_6e441a" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis_37eec4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_a7ca35" xlink:to="loc_us-gaapBusinessAcquisitionAxis_37eec4" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAxis_37eec4" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis_4f37e5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_a7ca35" xlink:to="loc_us-gaapAwardDateAxis_4f37e5" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_7839c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateAxis_4f37e5" xlink:to="loc_us-gaapAwardDateDomain_7839c8" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalClassACommonSharesMember" xlink:label="loc_classTotalClassACommonSharesMember_f49294" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classTotalClassACommonSharesMember_f49294" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConvertibleNoteHoldersOfClassoverIncPriorToMergerClassBMember" xlink:label="loc_classConvertibleNoteHoldersOfClassoverIncPriorToMergerClassBMember_d1fa59" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classConvertibleNoteHoldersOfClassoverIncPriorToMergerClassBMember_d1fa59" order="1022" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_HoldersOfBFACPublicShareholdersClassBMember" xlink:label="loc_classHoldersOfBFACPublicShareholdersClassBMember_227be4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classHoldersOfBFACPublicShareholdersClassBMember_227be4" order="1023" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_MarchThirtyOneTwentyTwentySixMember" xlink:label="loc_classMarchThirtyOneTwentyTwentySixMember_8cd646" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateDomain_7839c8" xlink:to="loc_classMarchThirtyOneTwentyTwentySixMember_8cd646" order="1024" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalClassBCommonSharesMember" xlink:label="loc_classTotalClassBCommonSharesMember_f5f77c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classTotalClassBCommonSharesMember_f5f77c" order="1025" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RestOfClassoverDEShareholdersPriorToMergerClassBBMember" xlink:label="loc_classRestOfClassoverDEShareholdersPriorToMergerClassBBMember_c84f8e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classRestOfClassoverDEShareholdersPriorToMergerClassBBMember_c84f8e" order="1026" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_BFACSponsorsClassBMember" xlink:label="loc_classBFACSponsorsClassBMember_18ca9b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classBFACSponsorsClassBMember_18ca9b" order="1027" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FounderOfClassoverDEClassAMember" xlink:label="loc_classFounderOfClassoverDEClassAMember_7630b8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classFounderOfClassoverDEClassAMember_7630b8" order="1028" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassoverDEEquityHoldersSeriesAPreferredSharesMember" xlink:label="loc_classClassoverDEEquityHoldersSeriesAPreferredSharesMember_d6893a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classClassoverDEEquityHoldersSeriesAPreferredSharesMember_d6893a" order="1029" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SeriesAPreferredSharesMember" xlink:label="loc_classSeriesAPreferredSharesMember_0fa0c7" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain_b83553" xlink:to="loc_classSeriesAPreferredSharesMember_0fa0c7" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaapSharesIssued_aa46e5" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_6e441a" xlink:to="loc_us-gaapSharesIssued_aa46e5" order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/EquityDetailsNarrative" xlink:title="995613 - Disclosure - Equity (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaapEquityAbstract_a3b690" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_816889" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapEquityAbstract_a3b690" xlink:to="loc_us-gaapStatementTable_816889" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_dd9aef" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapStatementLineItems_dd9aef" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_eee5a9" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapStatementClassOfStockAxis_eee5a9" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_045639" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_eee5a9" xlink:to="loc_us-gaapClassOfStockDomain_045639" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis_b7371c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapAwardDateAxis_b7371c" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_40cb0d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateAxis_b7371c" xlink:to="loc_us-gaapAwardDateDomain_40cb0d" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_2bb56f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_2bb56f" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_2693fc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis_2bb56f" xlink:to="loc_us-gaapRelatedPartyDomain_2693fc" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis_1e334f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapRelatedPartyTransactionAxis_1e334f" order="1040" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_e80f76" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionAxis_1e334f" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_e80f76" order="1040" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis_344924" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapPlanNameAxis_344924" order="1050" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_6d406b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameAxis_344924" xlink:to="loc_us-gaapPlanNameDomain_6d406b" order="1050" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis_5d1be8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_816889" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis_5d1be8" order="1070" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_aca2cc" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis_5d1be8" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_aca2cc" order="1070" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_64d221" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_us-gaapCommonClassBMember_64d221" order="1071" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_ab216c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_us-gaapCommonClassAMember_ab216c" order="1072" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaapSeriesAPreferredStockMember_f4ebc3" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_us-gaapSeriesAPreferredStockMember_f4ebc3" order="1073" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesCPreferredStockMember" xlink:label="loc_us-gaapSeriesCPreferredStockMember_3a0c3d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_us-gaapSeriesCPreferredStockMember_3a0c3d" order="1074" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_MarchThirtyOneTwentyTwentySixMember" xlink:label="loc_classMarchThirtyOneTwentyTwentySixMember_6c4374" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapAwardDateDomain_40cb0d" xlink:to="loc_classMarchThirtyOneTwentyTwentySixMember_6c4374" order="1075" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PreferredSharesMember" xlink:label="loc_classPreferredSharesMember_eec890" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_classPreferredSharesMember_eec890" order="1076" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_BFACSponsorMember" xlink:label="loc_classBFACSponsorMember_aaba97" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyDomain_2693fc" xlink:to="loc_classBFACSponsorMember_aaba97" order="1077" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LuoHuiMember" xlink:label="loc_classLuoHuiMember_5ac22f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionDomain_e80f76" xlink:to="loc_classLuoHuiMember_5ac22f" order="1078" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PIPEInvestorMember" xlink:label="loc_classPIPEInvestorMember_00238b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyDomain_2693fc" xlink:to="loc_classPIPEInvestorMember_00238b" order="1079" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TwoZeroTwoFourIncentivePlanMember" xlink:label="loc_classTwoZeroTwoFourIncentivePlanMember_cd33b4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameDomain_6d406b" xlink:to="loc_classTwoZeroTwoFourIncentivePlanMember_cd33b4" order="1080" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntellectualPropertyMember" xlink:label="loc_us-gaapIntellectualPropertyMember_b90249" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_aca2cc" xlink:to="loc_us-gaapIntellectualPropertyMember_b90249" order="1081" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TwoZeroTwoFiveLongTermEquityIncentivePlanMember" xlink:label="loc_classTwoZeroTwoFiveLongTermEquityIncentivePlanMember_09c244" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapPlanNameDomain_6d406b" xlink:to="loc_classTwoZeroTwoFiveLongTermEquityIncentivePlanMember_09c244" order="1082" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SeriesBConvertiblePreferredStockMember" xlink:label="loc_classSeriesBConvertiblePreferredStockMember_7ab872" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_045639" xlink:to="loc_classSeriesBConvertiblePreferredStockMember_7ab872" order="1083" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="loc_us-gaapConversionOfStockSharesConverted1_b8603c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapConversionOfStockSharesConverted1_b8603c" order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal" xlink:label="loc_us-gaapDebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal_2a28a2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapDebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal_2a28a2" order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockAmountIssued1" xlink:label="loc_us-gaapConversionOfStockAmountIssued1_de5324" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapConversionOfStockAmountIssued1_de5324" order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockSplits" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesStockSplits_c51978" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesStockSplits_c51978" order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_f94c17" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_f94c17" order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="loc_us-gaapPreferredStockDividendRatePercentage_757f40" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapPreferredStockDividendRatePercentage_757f40" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonStockNoParValues" xlink:label="loc_classCommonStockNoParValues_392c0f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classCommonStockNoParValues_392c0f" order="7" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_TotalNumberOfSharesAuthorized" xlink:label="loc_classTotalNumberOfSharesAuthorized_397c63" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classTotalNumberOfSharesAuthorized_397c63" order="8" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_FormerShares" xlink:label="loc_classFormerShares_b2646f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classFormerShares_b2646f" order="9" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ShareReceived" xlink:label="loc_classShareReceived_977f64" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classShareReceived_977f64" order="10" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ShareRedemptionsDescription" xlink:label="loc_classShareRedemptionsDescription_f01ce1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classShareRedemptionsDescription_f01ce1" order="11" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantDescriptions" xlink:label="loc_classWarrantDescriptions_56b6ca" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classWarrantDescriptions_56b6ca" order="12" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments" xlink:label="loc_us-gaapInvestments_2eac95" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapInvestments_2eac95" order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_e7edc4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_e7edc4" order="14" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaapShareBasedCompensation_68220e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapShareBasedCompensation_68220e" order="15" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_8fb1ab" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_8fb1ab" order="16" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_OutstandingBillPaymentAmount" xlink:label="loc_classOutstandingBillPaymentAmount_743606" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classOutstandingBillPaymentAmount_743606" order="17" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Cash" xlink:label="loc_us-gaapCash_b085ba" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapCash_b085ba" order="18" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_DescriptionOfPreferredSharsConversion" xlink:label="loc_classDescriptionOfPreferredSharsConversion_3b9a6f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classDescriptionOfPreferredSharsConversion_3b9a6f" order="19" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_LongTermIncentiveDescription" xlink:label="loc_classLongTermIncentiveDescription_3f5019" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classLongTermIncentiveDescription_3f5019" order="20" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaapPreferredStockSharesAuthorized_3ad9e4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapPreferredStockSharesAuthorized_3ad9e4" order="21" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaapCommonStockParOrStatedValuePerShare_277972" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapCommonStockParOrStatedValuePerShare_277972" order="22" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaapCommonStockSharesAuthorized_6a3add" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapCommonStockSharesAuthorized_6a3add" order="23" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaapPreferredStockSharesIssued_067a42" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapPreferredStockSharesIssued_067a42" order="24" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued_f22e77" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapCommonStockSharesIssued_f22e77" order="25" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:label="loc_us-gaapConversionOfStockSharesIssued1_3f41f2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapConversionOfStockSharesIssued1_3f41f2" order="26" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PeferredSharesDescription" xlink:label="loc_classPeferredSharesDescription_c08833" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_classPeferredSharesDescription_c08833" order="27" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueOther_1b3c44" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueOther_1b3c44" order="28" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightUnissued" xlink:label="loc_us-gaapClassOfWarrantOrRightUnissued_b34258" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapClassOfWarrantOrRightUnissued_b34258" order="29" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaapPreferredStockSharesOutstanding_9ab140" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapPreferredStockSharesOutstanding_9ab140" order="30" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaapCommonStockSharesOutstanding_af2ae1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_dd9aef" xlink:to="loc_us-gaapCommonStockSharesOutstanding_af2ae1" order="31" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/ConcentrationOfRiskDetailsNarrative" xlink:title="995614 - Disclosure - Concentration of risk (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConcentrationOfRiskAbstract" xlink:label="loc_classConcentrationOfRiskAbstract_dc0390" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_54f496" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_classConcentrationOfRiskAbstract_dc0390" xlink:to="loc_us-gaapStatementTable_54f496" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_3bd22f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_54f496" xlink:to="loc_us-gaapStatementLineItems_3bd22f" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaapConcentrationRiskByTypeAxis_8d753a" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_54f496" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis_8d753a" order="1020" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain_f32cd4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis_8d753a" xlink:to="loc_us-gaapConcentrationRiskTypeDomain_f32cd4" order="1020" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_RevenuesMember" xlink:label="loc_classRevenuesMember_5074b2" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapConcentrationRiskTypeDomain_f32cd4" xlink:to="loc_classRevenuesMember_5074b2" order="1021" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_PurchasesMember" xlink:label="loc_classPurchasesMember_8df509" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapConcentrationRiskTypeDomain_f32cd4" xlink:to="loc_classPurchasesMember_8df509" order="1022" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ConcentrationRiskPercentage" xlink:label="loc_classConcentrationRiskPercentage_b65521" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_3bd22f" xlink:to="loc_classConcentrationRiskPercentage_b65521" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit" xlink:label="loc_us-gaapTimeDepositsAtOrAboveFDICInsuranceLimit_e6ac7d" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_3bd22f" xlink:to="loc_us-gaapTimeDepositsAtOrAboveFDICInsuranceLimit_e6ac7d" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashReserveDepositRequiredAndMade" xlink:label="loc_us-gaapCashReserveDepositRequiredAndMade_b77e48" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_3bd22f" xlink:to="loc_us-gaapCashReserveDepositRequiredAndMade_b77e48" order="3" />
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://class.com/role/SubsequentEventDetailsNarrative" xlink:title="995615 - Disclosure - Subsequent Event (Details Narrative)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaapSubsequentEventsAbstract_66f239" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable_77ad3f" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSubsequentEventsAbstract_66f239" xlink:to="loc_us-gaapStatementTable_77ad3f" order="100" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems_d9d249" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_77ad3f" xlink:to="loc_us-gaapStatementLineItems_d9d249" order="2000" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis_2dadc1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_77ad3f" xlink:to="loc_us-gaapStatementClassOfStockAxis_2dadc1" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_2f88a4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementClassOfStockAxis_2dadc1" xlink:to="loc_us-gaapClassOfStockDomain_2f88a4" order="1010" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaapSubsequentEventTypeAxis_00801c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable_77ad3f" xlink:to="loc_us-gaapSubsequentEventTypeAxis_00801c" order="1030" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaapSubsequentEventTypeDomain_b4d695" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSubsequentEventTypeAxis_00801c" xlink:to="loc_us-gaapSubsequentEventTypeDomain_b4d695" order="1030" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_CommonClassBAdditionMember" xlink:label="loc_classCommonClassBAdditionMember_f134c8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_classCommonClassBAdditionMember_f134c8" order="1031" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaapSubsequentEventMember_5d087b" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapSubsequentEventTypeDomain_b4d695" xlink:to="loc_us-gaapSubsequentEventMember_5d087b" order="1032" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_689f43" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_us-gaapCommonClassBMember_689f43" order="1033" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassACommonStockMember" xlink:label="loc_classClassACommonStockMember_d677ed" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_classClassACommonStockMember_d677ed" order="1034" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ClassACommonStockAdditionMember" xlink:label="loc_classClassACommonStockAdditionMember_855cf4" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_classClassACommonStockAdditionMember_855cf4" order="1035" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_WarrantsMember" xlink:label="loc_classWarrantsMember_406aa1" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_classWarrantsMember_406aa1" order="1036" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesBPreferredStockMember" xlink:label="loc_us-gaapSeriesBPreferredStockMember_778d46" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain_2f88a4" xlink:to="loc_us-gaapSeriesBPreferredStockMember_778d46" order="1037" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_ReverseStockSplitShares" xlink:label="loc_classReverseStockSplitShares_826304" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_classReverseStockSplitShares_826304" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExcessStockSharesIssued" xlink:label="loc_us-gaapExcessStockSharesIssued_016ed6" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapExcessStockSharesIssued_016ed6" order="2" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="loc_us-gaapConversionOfStockSharesConverted1_73b32e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapConversionOfStockSharesConverted1_73b32e" order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock" xlink:label="loc_us-gaapIncrementalCommonSharesAttributableToConversionOfPreferredStock_5a672e" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapIncrementalCommonSharesAttributableToConversionOfPreferredStock_5a672e" order="4" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebt" xlink:label="loc_us-gaapConvertibleDebt_a2eae8" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapConvertibleDebt_a2eae8" order="5" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesSubscriptions" xlink:label="loc_us-gaapCommonStockSharesSubscriptions_622968" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapCommonStockSharesSubscriptions_622968" order="6" />
    <link:loc xlink:type="locator" xlink:href="class-20251231.xsd#class_SharesIssuedAmount" xlink:label="loc_classSharesIssuedAmount_17277c" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_classSharesIssuedAmount_17277c" order="7" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaapSharePrice_217339" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapSharePrice_217339" order="8" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventDescription" xlink:label="loc_us-gaapSubsequentEventDescription_845989" />
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems_d9d249" xlink:to="loc_us-gaapSubsequentEventDescription_845989" order="9" />
  </link:presentationLink>
</link:linkbase>
