You familiarize yourself with the test procedures and wait for 31 days. They will figure it out if you try to take 2 tests within the same time frame and put something nasty on your GMAT record.
P.S. Why would you want to retake just a week later anyway? You feel you can improve that much?
P.S. Why would you want to retake just a week later anyway? You feel you can improve that much?

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