For many GMAT test takers, Data Sufficiency questions are the most difficult questions on the GMAT. **But what do the hardest GMAT Data Sufficiency questions look like?** What skills and concepts do they test? What do they have in common? What Data Sufficiency strategies can we use to get these challenging GMAT Quantitative questions right?

In this article, I’ll go over the five hardest GMAT Data Sufficiency questions, what you’ll need to know to solve them, how to approach them on test day, and what we can learn from hard GMAT Quant questions about mastering Data Sufficiency.

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