Where condition in Pivot query in SQL Server

I want to display class and section wise result

tblStdReg: AdmissionNo,ReferNo,RollNo,SName,FName,Class,Section

tblSetMarks:AdmissionNo,Class,Section,Subject,MaxMarks,Marks

my Query is

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
        DECLARE @cols NVARCHAR(MAX)
        SELECT @cols= ISNULL(@cols + ',','') + QUOTENAME([SubjectName])
        FROM (SELECT DISTINCT SubjectName FROM tblSetMarks as sm inner join tblDefSubject as ds on sm.SubjectID=ds.SubjectID) AS Course  
   
        DECLARE @qry NVARCHAR(4000)
        SET @qry =
                  N'
  
                  ;WITH cteStudentMarksDetails
                    AS ( SELECT TA.AdmissionNo
                        ,(SELECT SName FROM tblStdReg TS WHERE TS.AdmissionNo = TA.AdmissionNo) as SName
                        ,(SELECT FName FROM tblStdReg TS WHERE TS.AdmissionNo = TA.AdmissionNo) as FName
                        ,(SELECT SPhone FROM tblStdReg TS WHERE TS.AdmissionNo = TA.AdmissionNo) as Phone
                         ,SUM(Marks) ObtainedMarks
                         ,SUM([MaxMarks]) TotalMarks
                         ,Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) as Percentage
                         ,(CASE WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 90 THEN ''A+''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 80 THEN ''A''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 70 THEN ''B''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 60 THEN ''C''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 50 THEN ''D''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 40 THEN ''E''
                                ELSE ''FAIL'' END ) AS Grade
                         ,(CASE WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 90 THEN ''OutStanding''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 80 THEN ''Excellent''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 70 THEN ''Very Good''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 60 THEN ''Good''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 50 THEN ''Satisfactory''
                                WHEN  Round((SUM(Marks)) * 100/ SUM([MaxMarks]),1) >= 40 THEN ''Work Hard''
                                ELSE ''FAIL'' END ) AS Remarks
                         FROM tblSetMarks TA
                         GROUP BY AdmissionNo
                      )
  
  
                  SELECT distinct AdmissionNo
                          ,SName
                          ,FName
                          ,Phone
                          , ' + @cols + '
                          ,ObtainedMarks
                          ,TotalMarks
                          ,Percentage
                          ,Grade
                          ,Remarks
                    FROM (SELECT AdmissionNo
                                 ,SubjectName
                                 , Marks
                                 ,(SELECT ObtainedMarks FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as ObtainedMarks
                                 ,(SELECT Percentage FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as Percentage
                                 ,(SELECT TotalMarks FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as TotalMarks
                                 ,(SELECT Grade FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as Grade
                                 ,(SELECT Remarks FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as Remarks
                                 ,(SELECT SName FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as SName
                                 ,(SELECT FName FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as FName
                                 ,(SELECT Phone FROM cteStudentMarksDetails csd Where  csd.AdmissionNo = sm.AdmissionNo) as Phone
                         FROM tblSetMarks as sm
                         inner join tblDefSubject as ds
                         on sm.SubjectID=ds.SubjectID) p                 
                    PIVOT (MAX(Marks) FOR SubjectName IN ('+@cols+')) AS Pvt'
                    EXEC sp_executesql @qry

now how to show class and section wise result???