Hi camontoyac,
I'm sorry to hear that your 2nd attempt did not go as well as planned. Since you've put all of this study time into preparing for the GMAT - and you're not actually that far from a 650+ right now - switching to the GRE is probably not the best choice. Before we can discuss how you might best continue with your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
1) On what date did you take your 1st Official GMAT and what were the Quant and Verbal Scaled Scores for that attempt?
2) Over the last 2 months, how many hours did you typically study each week?
3) On what dates did you take EACH of your CATs/mocks and what were your exact Scores for EACH (including the Quant and Verbal Scaled Scores for EACH)?
4) When are you planning to apply to Business School and what Schools are you planning to apply to?
If you took your GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich