I can talk about how to prepare efficiently for the SAT but not how to prepare without "prepping"
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There are SAT preparation books for the general population and also books for students who are already scoring well and want to do even better. The latter category of books, which is more suitable for your son, can be found on Amazon by searching "SAT 2400". We bought a book by John Chung. SAT math questions increase in order of difficulty within a section, and his practice should be on the more difficult released questions.
