GMAT Tip: That vs. Which

Photograph by Beau Lark/Corbis

The GMAT Tip of the Week is a weekly column that includes advice on taking the Graduate Management Admission Test, which is required for admission to most business schools. Every week an instructor from a top test prep company will share suggestions for improving your GMAT score. This week’s tip comes from Brent Hanneson, creator of GMAT Prep Now , a Web site offering on-demand videos that teach GMAT skills.

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