I took the Princeton review course. And already sold my book to one fellow SDNer.
I know some of my classmates still have those books. Lemme know if you're interested so I can ask them for u.
Princeton discontinued their DAT business. That's a great loss for predental students. As their gchem and ochem problems are so closed to the real test
Detail about the Princeton books:
The review book is as thick as the big Kaplan book. It has good taxonomy part.
The problems work book has good practice problems. Very, very helpful.
Princeton also has 3 paper tests.
If u guys go to a princeton center and ask for it, they might still have unused books willing to sell to you.