Whew, I took a risk taking three tests in one day - especially since I have been out of school so long (received a B.A. in Chemistry 1988) - I work full time as a chemistry teacher in a private school. I found out I passed all three subtests (118, 119, 121) on December 3. I didn't study at all for the chemistry cset 121, but I studied for 2 hours a day starting in middle September. This is what I found useful: 1. UC Irvine open course ware for cset 118, and 119 - they have a whole bunch of multiple choice tests and quick summaries 2. Physical Science textbook by Paul Hewitt - If you read all 35 chapters, you should do very well on 118 and 119. I skipped the first 12 chapters since I have always liked physics, but if you don't, make sure you read the first 12 chapters. 3. For the cset 119, (biology and chemistry) I found the book 5 steps to a 5 in AP Biology really helpful since they summarized the material very nicely in each chapter, and had great practice tests which supplemented the online material from UC Irvine 4. Although I didn't study for the chemistry subtest 121, I believe that the book 5 steps to a 5 in AP Chemistry would prepare someone well 5. Also for more practice chemistry quizzes online, google Adrian Dingle's AP Chemistry quizzes. A fabulous resource. 6. I have listened to the chemistry lectures on Khan Academy and he does a good job - but you don't get practice problems. Does anyone have good pointers for preparing for the U.S. Constitution exam?