A crosstab query gives the totals for students in particular classes per the Class they belong to, i e
College A – Class1 4, Class2 12, Class3 17
College B - Class1 12, Class2 124, Class3 12
College C - Class1 5, Class2 16, Class3 7
College D - Class1 4, Class2 13, Class3 9
Etc etc...