OK, then I guess you have a table like:
tblStudentExam
StudentID
ExamID
Score
(optionaly a date the exam was taken could be added, etc.)
This table is effectively a relation between a table tblStudent and a table tblExam.
For reporting the Max Sore(s) you can now use a "Group By" query like:
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select ExamID, Max(Score) as MaxOfScore from tblDtudentExam
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Group By ExamID
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You can construct this query using the graphical query editor. Just select the table, the fields ExamID and Score and press the "E" looking GroupBy button.
The press the datasheet button to see the result.
Nic;o)