I would start off with Kaplan Blue book for starters. Read through the Chem and Organic section (the bio section in this book is pretty crappy). Biology I would use AP Cliffs Biology. Take notes, reread, use wikipedia, google things you dont know, make sure you really understand the concepts behind chemistry and orgo. After you feel you have a firm grasp of the concepts, I would try to get some practice materials to work through such as Kaplan Subject Tests and Destroyer. After you have gone through these a few times (yes few times) I would move onto full lenght tests in order to get the timing down. Dont worry about the # questions you get wrong while you are taking these practice tests, rather try to learn from your mistakes. If you got a chemistry problem wrong which dealt with rate laws go back and reread that section, do a few rate law problems, make it stick in your head and try not to repeat that mistake. Do this for every problem and it will definitely help you in the long run. For PAT section, I used Crack DAT PAT the 10 tests one. I found that they were challenging but I wish I had practice more on a consistent basis so make sure you do a little everyday even if it isnt a timed PAT test. Math-some people are good at it others arent. If you are like me and arent good at math I suggest getting your hands on an SAT MATH 1C or 2C subject test book (i like the princeton review math review book for this) Go through it and then work on problems. Try to find short cuts and tricks to solving the problem better. Good luck studying!