Hi ParulSaini,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, the CAT score results you are referring to show that you essentially performed the same each time (about 640 +/- a few points). From your original prompt, I think that you might think that there's something "wrong" with the Veritas CATs, but have you had a chance to properly define YOUR performance on each of your CATs?
Test Day is a rather specific 'event' - the details are specific and they matter, so you have to train as best as you can for all of them. The more realistic you can make your CATs, the more likely the score results are to be accurate. The more you deviate, the more "inflated" your practice scores can become. If you're skipping sections, taking the CATs at home, taking them at different times of day etc., then you are not properly training for the FULL GMAT 'experience' - and your scores could vary depending on those details.
Completing a full review of your performances (with the goal of trying to determine WHY you're getting questions wrong) is also extremely important. Maybe there are concepts that you don't know very well, but maybe you know them just fine and you're making lots of little mistakes. While a full CAT Analyzer/Mistake Tracker would be a lot more detailed, there are some essential questions you should answer after reviewing each CAT (and the more specific you can be with your answers, the better):
After reviewing each section of your last CAT, how many questions did you get wrong....
1) Because of a silly/little mistake?
2) Because there was some math/verbal that you just could not remember how to do?
3) Because the question was too hard?
4) Because you were low on time and had to guess?
5) How many Verbal questions did you 'narrow down to 2 choices' but still get wrong?
GMAT assassins aren't born, they're made,
Rich
