The best resource is the Kaplan Q-Bank (sorry, you need to take the class to get this one) for everything but PAT, do all of them. Yes, I mean all of them. Watch those videos too. Take all full-time practice. Oh, and then do all the Q-Bank again. TopScore is the only thing similar to the real thing for the PAT. It is not that close (nothing can really compare), but it the best there is.
Oh, and get a hold of the sample DAT from the ADA! It is an excellent resource that most miss. It is an actual DAT, some of my questions reapeared almost word for word.