The Clear, Simple Guide to GMAT Data Sufficiency
-Categorization of every GMAT Data Sufficiency problem type, and where you can find it in the Official Guide
-Explanation of how to approach each sort of problem, centered around the biggest mistake people make with Data Sufficiency (hint: you're doing way too much work)
-Detailed Official Guide question breakdowns and explanations
-The only guide to Data Sufficiency you'll need to buy!
-Minimum price: $20
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