I know most people will pick Belle just because she reads (which doesn't make sense, because she reads fairy tales just for fun, not history or math or anything), but I think Tiana would be the overachiever. Not just so she could get a scholarship for college or anything, but she's naturally a hardworker. after this, Cinderella or Belle.

She's a perfectionist

And Rapunzel. Belle would just care to get good grades in the reading parts of school nothing else really.

If there's one princess who's a perfectionist it would have to be Tiana

Ambitious, determined, hard-working: fits the profile of a good student perfectly.

She'd be always very determined to be on top of the class.

or Tiana

Definitely

^Yes.