With Manhattan, I'm not looking to buy an entire 7 book series until I have identified my strengths and weaknesses using the core books. Which book would be the equivalent of a comprehensive gmat prep guide? And is it necessary to buy the separate math and verbal OG books when there is a comprehensive Original GMAT practice guide/ are the questions any different? Same with Kaplan. I'd appreciate any clarification from anyone experienced with the GMAT as I'm just starting my preparation.
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