The Biology section is loaded with facts. It is overflowing with facts. Small things. Big things. All simple things though. With SRS and the Biology card models this is straightforward.
Most of the information in the Bio section will come from classes. The exam assumes several years of Biology. Wikipedia fills in gaps and explain things well. Many people use Wikipedia exclusively to learn the Biology material for the exam. Others suggest Campbell’s AP Biology, saying it is almost exactly what is covered in the Biology section of the exam.
I found Wikipedia, DAT Destroyer and practice tests to be sufficient. However if more information is required, there are more resources listed in the Biology: Helpful Tools article. The questions are all straightforward and cover basic facts. The only trick is that there are a lot of facts. SRS and consistency makes this section a breeze.