[quote=@Inertia]
[@Zeroth]
Can you please make a quick list of who's in which classes, like a list of the freshman, sophomores and juniors?
[/quote]

Freshmen - Tatsumi, Nina, Matsuri, Daisuke, Luca
Sophomores - Sou, Yasu, Ayah, Kosoku
Juniors - Tonaka, Namari, Mine, Dirk

Of course, this only includes one of the just-recently-accepted characters, Nina. For those that are just getting characters up, there's a year margin with the classes so feel free to pick between the two classes that match your character's age.