Actually when I asked for extra reading comp help, my princeton review teacher told me "I wish I could reccommend our 'cracking book' but it's it's the reason I'm writing 'this one'"
By 'this one' he was referring to the book he is currently writing for the princeton review "LSAT Workout" .. unfortunately it won't be available for another year or so.. not nearly enough to help us
Unless you are some weird, freak of nature, autodidact, by far the best thing you can do is get into a classroom! And make sure you have good teachers!
If you're taking a course in NYC I can recommend one phenomenal teacher, one OK one, and one to stay away from (all princeton review)