Of the Princeton Review items, did you find any to be particularly helpful? ie the science review? or science workbook? or verbal workbook? my friend has some to let me use, but are they worth it? I have loads of other materials from bookstores already, and the AAMC materials. is the princeton review stuff a waste of time? or, are kaplan materials better? she has those too. anyone recommend a particular item that I should ask her for? thanks.