Rimpy,
I got a 24 on the biology section and yes, I basically tried to master every single iota of information that I could get my hands on. The Kaplan Review book is not detailed enough for the biology section. It's ironic the Kaplan book is too much in detail for General Chemistry and Orgo but not biology, the most unpredictable subject on the DAT. The subject tests help a little if you are enrolled in Kaplan. However, I found other study guides like "high yield" help as well. For biology master, I mean master everything you can absorb because some of the questions are very weird and every little bit helps. Everyone told me don't study anatomy or physiology, focus on animals. My entire exam was physiology and anatomy and ecology and plants and kreb cycle. It is very random.
I have some biology sources (awesome ones) to study for the DAT, PM me since I am cleaning up my DAT library right now.
Good luck,
DesiDentist