Fire Emblem: Three Houses

• Fighting low level battles for study sessions does not consume a charge, only the ones that explicitly say that they consume will do so. Coupling that with the fact that units heal between battles, and you can access the market, you basically can farm levels until your units or gold run dry.

• The above tip only works in normal mode. Every battle costs points in Hard (making leveling up your Professor lvl even more of a priority since it gives you more battle points)

• It's hard to truly prioritize Professor Level, but just Do Things and it should get higher pretty quickly. Finding little glowy blue spots around the map can give you the points, too, and after a month or two you can even raid your students' rooms for casual reading material, worth a couple hundred points each.