- Collect and re-order books in the library.
- Clean the cafeteria.
- Clean the labs (assuming labs exist, if they don't I think they should!)
- Drag away old training dummies and set up new ones (it would be funny to get shot at occasionally as you do this).
- Pyromancers: keep fires going (like the one on the common room that doesn't actually burn the logs - the fueling energy has to come from somewhere, right?)
- Hydromancers: Help keep water supplies stocked, maybe channel some energy into magical fountains around the grounds or something?
- Aeromancers: Channel energy into the aero lift.
- Geomancers: Repairwork and upkeep on the stone walls?
To avoid people getting rich off automating University jobs, there could even be a credit system, where instead of riln, you get credit that can only be spent in University shops.