I had to modify some of your formulas to remove zeros and errors. For example, in Quizzes!AK2
Otherwise, you wouldn't be able to get an average easily. I added a % Attendance in Column BM of Attendance. You might want to modify that one similarly to the one above so that if attendance is 0, it's not included in the average. For your charts, I used INDEX and MATCH to find your dropdown name in the appropriate spreadsheets. The charts automatically update when you change the name. Is this what you are looking for?
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