What are the chances of UFT revoking my admission offer?

UFT sent me an offer of admission for life sciences. I accepted it. However I am worried that they might revoke my offer, because my average has dropped a little. It is not that I am just taking it easy, the problem is I have a lot of work and I am not getting a chance to apply my full effort. Exams are next week, and rite now im just worried that I might do bad and that UFT might revoke my admission. So can anyone plz tell me if the chances of UFT revoking my admission are high or not. plz and ty