Your test is pretty close - you should definitely start taking the tests ASAP!

One element of taking tests, just as Mohater said is to understand where you are and what you are missing.

If you have not taken GMAT Prep - definitely take it (

download GMATprep) - it will give you a pretty close idea about your final score. Also, you can use

http://gmatclub.com/gmat-score-estimate/ to understand where you are.

Depending on what you find out, you may want to consider rescheduling. I am concerned that you are too close to your date and have not done much full-test practice (including AWA).

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