What is the best SAT preparation book that I can buy?
If you can only afford one book, buy the official study guide from CB (blue book) If you can buy more than one, I suggest Rocket Review for Writing, Grubers for math (though I did not use it that much) and Direct Hits (larry krieger) for CR vocabs. As for CR, I recommend that you do a whole bunch of practice and get to know the type of questions that appear on the test.