I had a boyfriend break up with me on the day of a math final once, after he had toyed around the idea for a long time without telling me. It was also before Christmas and I’d bought him his gifts and everything. However, his friends suggested that he go ahead and get it over with and break up with me instead of waiting until after the holiday. In my opinion the timing was awful and I wish he would have told me when he started having those doubts and decided he didn’t want to date me anymore, but in your situation I’d say it’s best that you wait it out until the stress of her exam is over and you no longer have legal issues that would need worked out (the lease with both of your names on it). My advice is, don’t just spring it on her out of the blue... I’d suggest trying to talk and share your feelings about the whole deal just so she doesn’t get it dropped on her. That’s one thing I know I hated. But good on you for noticing that breaking up before her final would affect her negatively. Best of luck