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You can buy the Manhattan Prep Study Guides on Amazon or in your local B&N. The books are great and should be reviewed consistently as you will understand more of the content each time. This review is not about the solid study material. Manhattan Prep's online tools (especially the Archer tool) are essential. The office hours (phone conferences with instructors) were invaluable. Understanding what to do to get past certain plateaus was only possible for me after quick chats with the instructors. I used the Online Self Study program over a 2 month period and scored a 720, 180 points above my diagnostic test.