Third Time Not a Charm - Really Depressed

I sat for my 3rd GMAT test today and unfortunately I did not do very well. I got a 630. My goal was to hit a 700, with a minimum of a 680. The following are how my scores break out per each test.

3/26/12
Quant: scaled score 40, percentile 55
Verbal: scaled score 36, percentile 79
Total: 630, percentile 73

1/27/12
Quant: scaled score 40, percentile 55
Verbal: scaled score 38, percentile 83
Total: 640, percentile 74

12/23/11
Quant: scaled score 41 percentile 57
Verbal: scaled score 35 percentile 74
Total: 620, percentile 70

I don't understand what happened. I really felt good today, like I was at the top of my game. If you would have asked me right before the test results what score I think I got I would have said probably 700 or 690 or 680 or at the very least 670.

I was scoring around 700 on MGMAT CATs the last few weeks. Although, this is the 3rd time I've used the MGMAT CATs. And, on my last Kaplan CAT I got a 680. Although, before that I was scoring around 610 on the Kaplan CATs. I also just got finished taking a Kaplan Advanced GMAT course.

It doesn't make sense to me, especially when I was doing so well on my practice CATs. Could I have gotten a bad set of questions on my real GMAT test?

So, where should I go from here? Any suggestions? I am going to have to throw in the towel and give up pretty soon.