Should I retake the SAT subject test for Math II?

I took the test and got a 770. I know I can get an 800 if I try again sometime in the near future before I forget everything and AP Calc. The problem is, though, I have 3 other subject tests that I want to take, and one I need to prepare for because i'm not taking AP Bio next year. Is it worth it to retake the SAT subject test for math? or is it decent enough?