I haven't been able to find this anywhere and I know some majors or were alluded to throughout S1/S2. It seems like the characters take a variety of classes right now that don't point to one specific major. Here's what I think it would be, share yours!

Leighton: Math with a minor in Women/Gender Studies. She mentioned a math major in S1 and has shown a growing interest/advocacy in gender equality as the show progresses. It would also be funny because her dad bashed majors that ended in 'studies' during Parents Weekend.

Whitney: Biology/Chemistry because of her newfound interest in S2 or Kinesiology because she's an athlete. Maybe a minor in Psychology or some sort of social science.

Bela: Creative Writing or English to build on her comedy writing. I could also see her doing an independent 'create your own' major. She would also minor in Bio or Chem to appease her parents.

Kimberly: She mentioned Pre-Law in S1. I could also see her doing History or Political Science. She would minor in French since it's her 'best' subject and avoid Econ at all costs.

Canaan: In S2 he won an award in the business school so he could be in Econ/Finance/Management. Maybe a minor in Entrepreneurship or Computer Science. I could see him using those degrees to start his own business.

Lila: Management or Marketing since she got the Sips manager job and has a knack for leadership. She's also funny and has a dramatic flair so maybe a minor in Theatre.

Eric: He would def be in Creative Writing or English for the comedy writing aspect. I could see him minoring in Film or Media Studies because of the cultural influence/references that are needed to write good comedy.

Willow: Political Science, she mentioned wanting to join student government in the off season. I could also see her minoring in Philosophy or Sociology.