Will my Sim have to quit his job to go to the university

Is this confirmed because Twallan said that the university courses are treated like Ambition's careers. You can only have one career at a time so I was wondering if they would do that especially since you will get a career jump when you graduate. If Uni was treated like a vacation then I would say it would be put on hold, but since it isn't,exactly,I don't know.