Sarah is definitely the dumbest person in this school and for the smartest.. that's a little trickier, but I think I'll go with Nova.

Sarah, and smartest is Yue or Nova with no contest

Dumbest... Sarah, Smartest... hmm... Yue

Sarah...

Dumbest is Sarah and smartest is Yue

Dumbest is most definitely Sarah, smartest is a little harder, but if I had to guess I'd say Nova or maybe Yue

Dumbest = Sarah and Smartest = Shiryu

Sarah is the dumbest and Nova is really smart

I have to say with out a doubt, Sarah is the dumbest creature on the planet, so her for dumbest and the smartest one in the school is probably Nova, Yue or Lumina

Um.. not sure I want to go into such things, but my best guess is that Sarah is the dumbest and Yue, Lumina or Nova is the smartest

As a teacher I'm not sure I should really measure students like this, however judging by the test scores I will have to say Yue generally have the best over-all score on all the tests I've seen from her and Sarah, the poor dear usually has to do make-up work.

I know it's wrong to talk about the students but dumbest = Saori + Sarah and smartest = Shiryu, Yue, Lumina and Nova

Hm... well, Yue's probably the smartest one, but not sure who the dumbest one is...

Hm.. I think the dumbest in school is most likely Sarah and the smartest is probably either Nova, Yue or Shiryu

I think Shiryu is the smartest and Sarah is probably the dumbest...