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Grammar GeekHere, I've only heard "at the top of her class."Thanks, GG.
Hoa ThaiHi Angliholic,
A is on [the] top of B = B is under / underneath / beneath / below A.
When A is a part / member of a set, A can only be 'at the top', especially when we talk about ranking. A, a student, is a part / member of a class; thus, A cannot be 'on the top of ' it, for 'at the top' means first. Here is another example of 'at the top of':