Here is what I used for the subjects on the DAT
BIO: Kaplan Books (DAT and MCAT), Schaum's Outlines Biology, Kaplan MCAT flashcards
The biology section was pretty straightforward really. I am almost sure that I missed a majority of the questions dealing with the biology of "non-human" organisms LOL!! I took general biology 4 years ago, so most of the non-human stuff was out the window...BUT the schaum's outline did help!
GCHEM: Kaplan Books (DAT and MCAT), Schaum's Outline College Chemistry (this wasn't helpful), Kaplan MCAT flashcards
I really enjoyed the MCAT flashcards!! They were great for the conceptual questions on the DAT...also I was surprised in the lack of calculation problems (It was a nice surprise). I was extremely worried about this section pre-DAT because I took GCHEM 4 years ago...it went pretty well though.
OCHEM: I really didn't study for this section. The ACS exam was a couple of weeks before my DAT, so the information was still fresh in my mind. The ACS exam was MORE DIFFICULT than the DAT!! If you understand the concepts behind why the different mechanisms occur in such and such way you should be fine. If you don't understand the concepts behind the "madness" I would whip out an orgo text book. The greatest Orgo book around is ORGANIC CHEMISTRY 6th Edition by L.G. Wade Jr. It will change your life haha
PA: I found CrackDAT PA to be the most helpful...
QR: ask someone else LOL!! Although, I did do the Kaplan, Topscore, and CrackDAT exams....scored an ave. of 19 on those tests...hmmm
I will just make up an excuse...I REALLY had to pee
RC: I enjoyed this section. The passages weren't all that dull...surprising I know. The answers to the questions were not horribly embedded in the text and were easy to find. I didn't study directly for this subject, but I would say that being an active researcher helped me out. I am used to sifting through numerous journal articles that deal with complex issues....so it might help to get on pubmed find a full text article and read the intro and conclusion...THEN explain it to one of your friends. Here are some key words of some fun (haha) subjects to pubmed: NADPH oxidase and Ang II, GSH and GSSG, Chronic Exertional Compartment Syndrome, Excitotoxicity. Those are just some suggestions of random topics, so pick an article and go crazy.
Good luck to everyone who is taking the test in the future. If you have any questions on a section I would be happy to tell you what I thought about it more specifically.