If you haven't already done so, then purchase Topscore. Acethedat.com has a tough PAT section which simulates the real thing to a better degree than Topscore. Though read through some of the other posts to become familiar with some of the problems associated with their service. If you are looking for instructions and strategies for the PAT, then go to your local bookstore and thumb through Barron's DAT guide (I wouldn't buy the book as other sources do a better job covering the material).