NemoGDL2345,
What about taking a break, and when I say a break, is a long one.
You are frustrated right now, and this is normal...
Take a few months off from the GMAT. You might want to think about it again but without your actual frustration. This is only an exam. In fact ,life goes on... After a while, you will have to find out what are your weaknesses.
It took me few months to understand my weaknesses.
The first time that I did the GMAT, I thought that I mastered the exam content, but in fact I never mastered the core content of the verbal section. I guessed on a lot of verbal questions. I never remembered the basics. Plus, I am no a native english speaker, the fact that ETS was mixing SC, CR and RC was very stressfull to me.
The second time that I did GMAT, I mastered the basics, but
I managed very badly my time. I remembered spending 10 minutes on a long counting numbers. The problem wasn't hard. Also, I remembered passing another 15 minutes reading a simple RC passage.
Just take a break, you will definetly come back stronger...