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You ask if the Barron's GMAT book is really necessary. The book is well suited to the GMAX Online course, and is used throughout the sentence correction lessons and homework. I agree that it may be less valuable as a self-study guide, but we don't intend you to use it that way.
Nevertheless, many students find the math review and questions helpful.
i completely agree, i wouldnt spend my money on barrons its just not worth it, most of their explanations are not making any sence or plain wrong. its horrible, ignore it, spend your money on something else. like beer