Kaplan's PAT subject tests are great confidence builders (Try getting these from a friend). I had trouble with their science material because their stuff is kind of all over the place. Their Lesson books have diff. material than their review notes, the flashcards were too simple, the subject tests varied from easy to hard as hell, and their online syllabus was another mess. This is a major reason why I liked DAT Destroyer so much. Destroyer is a great comprehensive review of all that u need to know for the sciences & the QR, & it's consistently tough throughout (you must do these exams over and over and over again, to get a complete understanding of the material). And Topscore -or- Achiever are essential as far as timing is concerned (and don't use scrap paper, use a dry erase board while practicing) 😎
{And practice really hard on ur Read.Comp. cause the boards have become more passage and case based, so this is a really important score. They use it as an indicator of how well u might do in the future, if accepted}