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