Biology questions are all over the place. For my test, I got a good chunk of genetics and development, but reading other people's posts, the bio section is really random.
This is what I did, but you'll have to decide if it's good for you or not. I read through the Kaplan book and kept note of which sections I was weak in. Then I concentrated on those sections by reading the related chapters in my bio textbook I use for school. I took the practice test in Kaplan book and did 100 questions in destroyer. Go over the problems that I missed. Look at what sections I was still weak in and studied more.
I ended up studying embryo development, reproduction, and physiology the most.
Good luck!