I took the practice Data Sufficiency exam out of the official GMAT review guide and scored very poorly on all the questions. About a little less than 50% correct. What am I doing wrong? Obviously I did better on the beginning part of the exam because the questions were easier than the ones later in the book. Is there a specific strategy I can follow? I've heard through the grapevine that guessing answer E on the DS questions was probably the best bet. Any info or insite is greatly appreciated.
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