Hi n2008,
To start, a 580 is not that far from a 640+, so you might be able to make the necessary adjustments to how you handle the GMAT in a relatively short period of time. Before we can talk about how to make that happen, I'd like to know more about how you've studied so far:
1) What were your Official Scores (including the Quant and Verbal Scaled Scores) on your 3 Tests?
2) How long did you study before taking each Exam?
3) What resources did you use each time?
4) When are you planning to apply for Business School?
For what it's worth, I can confirm that our discount codes ARE active.
GMAT assassins aren't born, they're made,
Rich