<p>bluewhite - tell him you “rethought” your school of choice/ got “rejected” by Yale and decided to go to your local community college/basic university (ya know, all the one’s you see/hear advertisements for). Then mention that _____ College puts an emphasis on math grades so you’d appreciate it if he reconsider the grade he’s going to give you. Trust me. If this sad, pathetic so-called teacher is going play dirty games to stop you from going to a great college, you should go to GREAT lengths to ensure he doesn’t screw you over. I’d pull out all the stops. Get in contact with your counselor, principal, superintendent, even gov’t officials if you have to resort to drastic measures. Do what you gotta do. 
I’ve been down this road before as well. Nothing changes grades better when you have the superintendent threatening to fire him and a local news channel investigator team on the phone!</p>