Try the Knewton course. They have a 50 point guarantee and it will be much less expensive than a private tutor. Send me a message offline and I'll be happy to talk to you about it.

But aside from that, there is no point in calling the GMAC. They explicitly make no guarantees regarding the GMAT prep and the actual GMAT exam. The whole thing would be a waste of time.

If graduate school is for you then keep trying. Ultimately, not only does it come down to knowing the fundamentals, but also extracting the fundamentals from a question. Also, you have to make sure you practice as you do on the test. Go through the AWA questions, quant, 8 minute breaks, verbal.

You can improve, but you probably need a different way of approaching problems. I took a course as well and my score went down. I took another course and my score went up. So it's not that one is bad and one is good, the second course is just better for my style of learning.

Hang in there. But, approach the next exam like it's going to be your last.

WOW

It seems like you are going in circles... But as said above, more information is needed.

I think the classes that you’re taking don’t help.

My take on this is to approaches it less like a test, but rather a little questioner on all the fundamentals that you've gathered throughout your life.

The classes that you take are sometimes designed for people to score 800 on the test, but that's obviously not what you're trying to achieve. You just want a decent score to get into a decent school.
My best advice would be to change your attitude towards it. Stop seeing it as a test.
Try to look at the logic section as a court case, where you’re a lawyer trying to argue your point. What would you say to best cover your position and not leave any loop holes for your opponent to exploit?
Try to look at the quantitative section as you trying to solve a problem through your own reasoning, rather than using different types of formulas and methodologies that are given to you by your instructors. Instead of seeing a question and trying to remember an example that you’ve done in class or your practices, try to see every question as a problem that you’ve never encountered before and solve it through the fundamental knowledge that you know.
Approach the English section as everyday life. You know the basic grammar rules on what’s wrong and wrong, use and follow them. Forget the strategies that you’ve been taught in class and simply treat it as everyday life. What’s the simplest form of communicating a point?

It seems like that you’ve been trying very hard and it hasn’t been working. Maybe it’s time to take a new approach. The points that I’ve made above underlines how I’ve approached the GMAT and I was able to attain a score that’s higher than my target with next to no studying (comparatively of course). I had to come across as bragging and that’s not my intention but using myself as an example, I had spent no more than 25 hours studying for this exam, and that’s including going to classes.
So anyways, good luck and hope what I’ve said here helps.

Hi,
What is the part of the exame in which you had more problems?

If its Math I would strongly advise you to purchase the 5 Manhattan books... Back in October last year I was a complete zero in Math (couldn't even get past the third question of the GMATPrep test 1, after 20 minutes...), and yeasterday I had q49 on the real GMAT exam.

Manhattan explains very well all the topics that appear in the test, from the most basic to the most advanced ones... and their exercises (especially the question banks on-line), tough demanding, are priceless.

If your problem is verbal, then i would advise you to try Powerscore CR Bible and Manhattan's Sentence Correction.

Above all don't EVER EVER EVER EVER GIVE UP....

Best of luck