there are universitites that take your application even if you have a low score. but your acceptance will depend on other things then. NYU, USC and a couple of others take applications even with 83 and i have seen people with 81 get into USC in last yrs session so you still have a good chance but if you are preparing for national boards i suggest that you take the exam asap as after december the scores will be locked and you wont be able to give it again