Thank you all for good wishes. It has been great pleasure to be part of such a community that shared the same pain.
GMAT is a boring test. That must be said first. So, you first need to learn how to deal with it.
On my initial try, I didn't prepared at all and I got my lesson. Afterwards, I started to keep an
error log which had helped me immensely. As I think, what I had kept doing was falling for almost identical questions again and again. When I started for GMAT, I had too many set backs as I started to speak English very recently and it was an unknown territory. So, I focused mostly on Verbal rather than Math.
All these CATs also about an attitude. I mean, how cool you can stay during the test. So, try to learn these thru those tests. Took as many as you can. But don't focus the scores even they are so good or so bad.
I took those CATs that came with PR and Kaplan but didn't pay attention to my scores. Each time, after a test, as soon as I saw my errors, I was happy as I thought that I would start paying more attention to these subjects from then on.
I went thru all available paper tests, and I think they are good source of practice. Also, I solved some gmat plus materials.
Princeton Review Verbal is much more close to the ETS style, in my opinion. Kaplan 800 Math is a good estimation of ETS style.
I also looked at some LSAT stuff specifically for CRs and I think it was useful. For SC, OG SC section is great and closest! Go thru it many times until you understand why a particular choice is wrong or right.
In my last attempt, I had a very bad distraction during Quant that made me think to cancel the test. So, try to focus and try to become a robot during whole test.
Finally, be very positive!!! That is the key! Don't forget, you are already a person who managed to have great career and now wants to touch better places. Be confident and you'll be able to get the score you have in mind.
By the way, I listed the books I had used in Buy/Sell forum, so if you like to see the material I used, please check my message.
Good luck!