Jack the Sailor: Yes, I think that's what the term "overachiever" was coined for (although I don't think 10% is enough to worry about).

I think that the concern was that people, especially students, who "overachieve" academically may do so at the expense of depriving themselves of other worthwhile experiences such as dating or physical exercise, and may wind up socially inept, sedentary, obese, etc.

I don't know whether that concern was justified.