Better Learn this phrase: “Would you like fries with that?” 
Come on. Get realistic. If your a senior, your grades have already been submitted to the colleges of your choice haven’t they? The schools either have, or will be shortly, making their decision. Your life isn’t ruined. And heck, in AP Calc, you get a second bite at the apple – the AP test. Pass that and maybe you get credit for it at college. Others have given good advice with regard to test taking and evaluation. Good luck.