Great question.
Information about DAT can be found here:
http://www.ada.org/~/media/ADA/Education and Careers/Files/dat_examinee_guide.ashx
buy the following items:
- DAT destroyer
- Math destroyer
- DAT bootcamp
- My bio notes or
@FeralisExtremum bio notes (free)
- cliffnotes AP biology 3rd edition (you can find for free online)
- chad's videos (courseaver) for math videos, general chem videos,
- make sure you download GRE math comparison style questions from
@orgoman22
- crack the DAT for reading comprehension and for PAT (perceptual ability test)
Head to DAT subforum on SDN to look at strategies (just read a bunch of people's breakdowns)