I would say 2 power training classes. One for specific powers, another for people to get used to other powers and how to interact with them.So like, they all have some class like Physical training together? Or a class where everyone in the school is together?
I said that because my oc has a new power, so I wouldn't get any interactions.I think like, the players is in one class for regular school stuff like history and math. But for the elemental training then they go to their respective elemental mentor, maybe there can be mixed elemental class like Glaceon said.