Main Character Development

I am reading Code Orange by Caroline B. Cooney. The main character is Mitty. I think its saying that Mitty doesn't wanna fail her advanced biology class because her parents want her to graduate as a med student and Mitty likes Olivia. I think Mitty trys to do her 10 notes assisignment before its due so he has a more likly chance of staying in the class. I think that Mitty doesn't want to disappoint his parents and he doesn't wanna leave the class without Olivia.