I just completed the math diagnostic test in the Official Guide for GMAT Review, 13th Edition (p. 20-26), and had troubles answering all of the questions. Is this common? I did well in all of my math classes (high school and college), but don't remember how to solve these problems. Should I be concerned already? Should I continue the 60 study guide or look at taking classes instead? I plan on taking the GMAT in early January.
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