| For what tests? The books have different authors and therefore varying difficulty.
In my experience - (from most difficult to easiest, based on personal experience of actually taking the test)
Chemistry: SparkNotes > Kaplan > PR > Official. I've gotten as low as 620 on SN, and a 770 on CB. 740 on Kaplan, and all over on PR
Physics: Barrons > SparkNotes > PR > Official > Kaplan. 650 on Barrons (although I had done NO prior studying when I took this test), 720ish on SN, 760 on two PR tests, 750 on Official (stupid mistakes though), an 800 in 30 minutes on Kaplan (however I had just read the entire book in one sitting so that might have helped :P) |