Please keep in mind that most NPC sims in University are enrolled in University, but do not go to class, this allows the game to put whatever they want in there. The only person that actually goes to class is your played sims, the NPC are just window dressing, if you move them in before graduating the npc sim will not get the diploma, because they did not complete all the course requirements for that degree. In order to get a NPC sim that graduated your need to wait until after the graduation ceremony is over and for off campus living wait until the college class tab disappears, this indicates you are no longer enrolled in University, find sim and ask sim to move in or get married, University NPC should come with a random degree. For University Dorms wait until the University Kicks you out of the Dorms before you invite said sim to move in or get married. If you do this before game will display a error as you entered dorm with 1 sim and left dorm with 2 sims, since all sims that live in dorms must go through the special enrollment menu.
