I used the Barrons guide to the DAT which was super and I also had another which was really lousy - i gave it away, but think it was orange and black - maybe princeton review? Not sure about that one, but it stunk - didn't even recognize the DAT in computer format. About 3 months before i tested, I started using the TopScore Pro practice software from ScholarWare, which was REALLY helpful for familiarizing myself with the test format. Just reacently I saw that Kaplan has a big red book out fo rthe DAT now, which looks pretty thorough