but that's exaclty what they want to show, how the best students performed in different years, whoever they are.. what about if the score of the best student gr

but that's exaclty what they want to show, how the best students performed in different years, whoever they are.. what about if the score of the best student gradually goes from 100 to 80 in within 20 years.. that would still reveal something about the university and the students, further analysis have to be performed, no doubt on that, but that would show some particular trend in how the students are learning / are thaught