For Arch: watching, class plans, [s]vacation in the Caribbean[/s]. As for everyone else, what would you be doing on a normal school day at a Duel Academy? You'd be allowed to watch, but if there were someone who didn't want to, they'd have some kind of study hall or something that they could go to.

@Josh: Exhibition Duel is not the same as an Entrance Exam. Brent's an old student. The Exhibition Duel is between two Duelists who get picked to show off to new students.