On a different note, answers to a lot of questions are already on page 1 so if you haven't refreshed that page then you should. I'm about to add all of the dialogue up to the last goal as I didn't get a chance to add that yesterday.
I bought the study circle so I'm going to go on hold now and see what the collections look like given I spent gems. Only have 3 bottles left to make now so don't want to finish early.
The prize for this part - and for all (I'm guessing 3 parts given there are 3 students on the screen shot) parts is to summon a student. You can see this info on the timed goal screen.