Kaplan DAT Book (know everything in it)
Kaplan MCAT Bio book (for detailed bio background)
Kaplan/PR AP Biology, AP Chemistry book (for practice)
Kaplan/PR SAT, SAT II IC, or GRE math section (for math background and practice)
Barron's DAT (for PAT)
Topscore (for practice)
your undergrad science text book (for reference)
and your brain🙂