Where can I find the answers to the official SAT study guide (blue book)?
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The answers are after all 9 sections of each individual practice test, but you have to pay online for the explanations.
https://satonlinecourse.collegeboard.com/SR/loginAction.do
On the right hand side of the page is a box called "For Book Owners." Sign in to your college board account (or make one if you don’t have one) and you can enter your answers to the tests. It will give you a free score report. For your scores on each section, it will give you a score range. For a more precise estimate, find the middle of this range. That is your score.