Just to clarify, the rules on repeating the GRE indicate that you take the test once per calendar month. Posts like this started freaking me out that I had done something wrong by taking the test at the end of august and again at the beginning of September. (I earned surprisingly low test scores in august which I knew were an aberration, so I took it again a few days later in the following calendar month and received a much higher score that was within my practice range.) I called ets today and they confirmed for me that the policy is what it sounds like: you can take the test once during any calendar month regardless of how many actual days have passed. The example the very polite gre rep gave me was that it is perfectly acceptable to take the test on 31 Nov and again on 1 Dec.. I wanted to spare any one else the unnecessary worry this caused me.
