Author:  Arthur Ahn, Kaplan GMAT Product Manager & Instructor

GMAT data sufficiency questions test your ability to analyze a quantitative problem and recognize which information is necessary to figure out the solution.  What a data sufficiency question does NOT test you on is your ability to calculate and number-crunch.  A simpler way of addressing this might be to ask yourself a question as you work through a data sufficiency problem: “Is this enough?”  Keep this in mind as you evaluate (and on test day, avoid) two specific common errors that test-takers make while taking the GMAT: