Yeah, I was thinking along the same lines. Like if a student at the Arcane University were to take a test or exam, what if they boosted their intelligence by 30 points? Would that enable them to remember more of the stuff they studied? From a game mechanic, it's flat out easy; allows you to have more magic points to use to cast spells. But applying it to a role play story or real life, what is it really doing? I sincerely hope the developers go into the practicalities and functions of magic more in-depth in the next game.
The instructors probably have some sort of spell or enchanted device that ensures their students don't cheat, or which allows them to catch cheating students. I'm not sure what they consider cheating but if I were a magical instructor I wouldn't want my students artificially boosting their intelligence before a test unless part of the test involved a demonstration of that ability.