What is OG? (Official Guide)

What is OG? (Official Guide)

Official Guide Review is (/are) the book (/books) published by the makers of the GMAT. OG consists of a lot of practice questions. All questions are real but retired, which means the questions in OG were actual GMAT once. The actual questions give us idea of how questions are asked and what are the topics covered in real GMAT. Thus OG reviews have highest credibility.

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