So, in Wizard City, we got registered for class and introduced to all the teachers, but we never actually went to class. So, maybe after the 2nd Arc Ambrose could call you into his office and be like, "you need to go to class, young wizard." And maybe there could be some stills of the wizard sitting in the classroom, with narration saying things like, "You doodled while listening to [professor] drone on about casting [first rank]." I'm not sure how this would end, but your professor or something could say, "you already know everything I was going to teach you don't you?"
YES- I know that it was implied that the wizard was going to class the entire game, but it was never SAID. And YES- I know that it was implied that the whole story took over a day, but I still think this would be funny.