Well I do have suggestions but they're likely to range from possible to impossible since I'm unsure how the game is structured with its scripting and what you're able to do with it.
1: A sort of cat n mouse chase idea with a single test, a single high AI teacher that always follows the player, all exits need to be touched instead of just two.
2: Broken vending machine, the player has to rely on items spawned in the map. Items could probably have a higher spawn rate.
3: Max AI Circle, vending machines/spawned items are only Oreos
4: Patience and endurance, a test is spawned in every room possible with wrong answers only, teachers start at lowest AI and gradually increase for every test taken.
There's a lot more I could probably list since I like coming up with ideas, hell I even have ideas for items that could actually fit with the game. But as I said before, I'm unsure of the possibility.