I feel sorry
but don't give up, if you are serious.
You can beat the GMAT, it has been done repeatedly and so can you.
practice, practice & practice ^ practice.
I am preparing
for the exam and am learning a lot time from these forums.
The magic seems to be practice, try to pick an approach, there are lots outlined on this forum, and follow it.
From my understanding, GMAT doesn't test your IQ, it tests your basics under pressure, so cover your basics, and practice.
Take easy on the exam day, believe in your selves.
for quant, start with ARCO, covers basics.
for SC, manhattan is gooooood(again from the 700+ guys). In general Manhattan books
appear to be good.
Cover OG, it's a must and better if you can cover it more than once. (Again, forums say, you can get to mid 600's).
Avoid McGraw Hill book for GMAT.
I am doing the above and my practice scores are hovering around 600.
get the gmat practice from mba.com and try it more than once. (I have read people taking it more than 6 times)
Good luck and wishing you all the best.