My Sim withdrew from a term and took off some time to have a baby. She went back after the baby aged up to a child, all her scholarships were still there. I didn't switch households but I don't think it would have made a difference—seems to me once you finish/withdraw from a term, your scholarships & enrollment will be there waiting for you for as long as it takes. The problem only comes when you enroll Sims and leave them to their own devices while they are enrolled in a term. Taking breaks between terms doesn't appear to be a problem.