Biology SAT II vs Physics SAT II

I have not taken ap biology and i have not taken biology since freshman year (i am a senior now), but i did very well in honors biology and am pretty confident in my memorization skills. should i take this subject test or should i take the physics one. i took ap physics 1 last year but i do not feel confident in the subject and got a 3 on the ap test. plus, a portion of the physics sat ii was not on the ap physics 1 test. do you think i’d be better off re-learning biology and memorizing that information or should i go for the physics test since it has a better curve?

Contrary to what some on CC seem to think, AP is not needed as prep for the SAT subject test.

AP Physics 1 covers only about half of the SAT Physics Subject Test, so, for me, it would be easier to refresh my bio knowledge, than learn E&M from scratch