Materials used for the DAT:
Bio - Kaplan Blue book, Cliff's Bio, and DAT Destroyer + Bootcamp
GC - Chad's videos, DAT destroyer, Kaplan Blue book + Bootcamp
Orgo - Kaplan Blue Book, Google, and DAT Destroyer + Bootcamp
Math - Math destroyer and DAT Destroyer
PAT - DAT Bootcamp, Achiever
RC - Crack the DAT, Achiever + Bootcamp
These materials worked for me, if I were you I'd search up some DAT breakdowns on this site - they're pretty useful.
As for the MCAT - my brother wrote it. He hated Princeton and loved Kaplan. I'd search through the MCAT forums to find out which book set you want to purchase.
Just note that there are differences between the two tests, I don't think there are materials that will cover both for you...