@Dutchess_Death Since I'm guessing it's a pain to play through a whole week to keep testing solutions, I can suggest a number of steps to take all at once. I'm not sure they're all necessary, but they shouldn't cause any harm to your save.
- Send your sims back home if they're not there already
- Install NRaas ErrorTrap, Overwatch, Traveler, DebugEnabler, MasterController, and the MasterController Cheats module
- Go into Documents\Electronic Arts\The Sims 3\Saves\[your save name] and delete the University.nhd file; this will delete the current instance of the university world in your save
- Click on each affected sim in turn and select NRaas > MasterController > Intermediate > Career > Academic Degree, and set the progress to zero credits
- Load your save, click on City Hall, select NRaas > MasterController > Town Options > Reset Everything, and let the command finish
- Click on one of your sims and select NRaas > DebugEnabler > Options: Smartphone > Sim > Fix Homeworld
- Use the MasterController command above to set your sims' academic progress towards a degree to whatever you want, for example you can set it to 48 minus the credits you want them to earn in the next term, so they'll be ready to graduate
- Use "save as" to rename the save, then quit
- Delete the five cache files in Documents\Electronic Arts\The Sims 3: CASPartCache, compositorCache. scriptCache, simCompositorCache, and socialCache
- Load the save, send your sims to University, and see what happens
When your sims arrive, they'll be in a brand-new instance of University, with all the default sims, buildings, etc. This shouldn't harm your save as long as you have ErrorTrap and Overwatch in place: they should clean up any stray data left over from the previous instance of the world.
I don't know that all this will fix the problem, but it's everything I can think of short of just cheating your sims a degree. That's of course doable with mods, but it sounds like you'd rather your sims be able to graduate.
