I don't recommend taking a practice test within 3 days of the real test. You'll tire yourself out (would you run a practice marathon right before the real thing?

). You could shake your confidence. Finally, any time you take a test, you need time to learn from it, and it takes at least 3-5 days of post-test review and studying to get everything you can out of each practice test experience.
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Stacey Koprince
GMAT Instructor
Director of Online Community
Manhattan GMAT
Contributor to Beat The GMAT!
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