My work around for this has been to build one of the dorms with the number of rooms I want sims to start uni at the same time or across x separate terms as non playables get moved out when you bring in another playable sim. Made the ground floor of it a skills area, a room with PC's/book cases & a research computer, communal lounge, communal dining, chess table, robotics table, easels, a gym etc. Also had an outdoor party area. Set one of the traits for the lot to study spot to help, I think I used homey & natural light for the other 2. Then back in the main world, I age up each sim in turn, apply to uni and once accepted, don't enroll, switch aging off for them & rotate to the next family and do the same. Once all the sims I want to attend from various households are accepted but not enrolled. I go back to sim 1, enroll them & move them into my pre-made ready dorm. Save & go to manage worlds, enroll the next and so on until I have all of them there in the same dorm. I do have the game set to pause lots on entry. After the last one is enrolled, I allocate each of them their bed. You might lose a couple of sim hours while you enroll them all but no more. I then have a dorm with all of my YA sims from the main world in it and drive myself insane trying to juggle up to 8 lots of timetables! I put aging back on for them in the dorm. I leave their families back in the main world with aging off, which is not ideal but it's the closest way to pausing them! If you want them to start a term apart then you have to leave them aged up to YA in the main world, with aging off, until the ones you play for the 1st term have completed that term, then after they re-enroll, do the manage worlds thing again & bring the next term ones in, same again for term 3. Managed to get 8 sims enrolled in the same dorm across 3 terms without them completely bombing their courses. They never left the dorm except for classes & literally studied, ate, slept while I sprouted many extra grey hairs & drove myself insane with all the schedules! Groups were out but I did go for an ambitious 4 classes each per term! It's not ideal & not how I would like to play it but sometimes we have to get a bit creative with our workarounds & that has been mine!
