I agree, fuck high school. 

So how's this: Urban fantasy, in an old college town(probably a fictional town in New England somewhere). Modern day, or maybe the nineties could be fun, but alternate universe. 

I think there would be very little, if any, focus on attending classes, like you said, more just the hijinks of a bunch of twenty-somethings. They aren't necessarily all magic users, or even all students for that matter. 

I think this is a world where magic is treated like any other general field. Like you could say that you're a scientist, or you could be specific and say you're an aerospace engineer. Likewise, you could say that you're a magician, or more specifically a kinetic thaumaturgist. 

I also think it's a skill like baking or working on cars. Obviously some people do it professionally, but a lot of people have some knowledge and skill in the subject that they've picked up here and there. Conversely, some people can't work a spell to save their life, and that's okay! 

I think the word "magician" has the connotation of being a trained professional, and the common word for a layperson who does magic is witch.