Ok this is what I think about these 1001 books, and the way mcat asks questions. For every passage in physicals sciences, whether it be physics or gen chem, there are 2 types of questions. The ones where you can answer, with just outside knowledge, by knowing a formula or, much more likely just knowing a basic concept, like Ideal gas's are found at High temp and low pressure. For these types of questions, I think the 1001 books cover 100%. I don't think they can ask any outside based knowledge questions in a passage, that was not covered by 1001. So, I'd say thats 50% of the PS questions. The other 50% are passage based, which the 1001 Q doesn't really help, nothing could help those. Thats just your innate skills at finding info from the passage. My 2 cents, do you guys agree?