Should I self-study AP Biology?

Hello, I am a junior attending high school. I am currently taking the following courses
English 3 H
AP Calculus AB
AP Physics 1
AP US History
AP Micro/Macro Economics
Spanish 4 CP
I plan on taking the AP exams in calc, physics, apush, and micro and feel reasonable comfortable in each one. I was just thinking over my courses for next year and realized that I want to take AP Physics C as my science. However I want to also take AP Biology. At my school, you need to take a study hall if you want to take two sciences and I am unable to do that since I have several graduation requirements I need to take care of next year. So would I be able to selfstudy AP Biology by May (which is less than 2 months away) or is that a bad idea? If i do not do that should I self study AP Biology for next year because i do not think it would matter whether or not a take the AP exam as a senior.

Also what are some good bio ap preperation books? I heard cliffsapbiology is a great book, can this be confirmed? also is there an updated version for the 2015 exams? Thank you so much!!!