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GMAT Focus 1: 745 Q86 V90 DI85
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That depends on what you want the other books for. Our 8 books are meant to cover the complete range of material on the test, but you will of course want to apply those skills by practicing in the Official Guide. I'll leave it to others to discuss whether our books are the best for your needs, but are you looking for *supplemental* material? If so, in what area, and are you sure you need more books? Most people find the three Official Guides and our set to be *more* material than they want to work through! :)