Hi mamu10,
To start, since that algorithm for the Official GMAT is proprietary, no GMAT company has an exact match for it, thus CAT scores can vary a bit based on the 'biases' involved in their respective designs. The most realistic CATs available are the 6 from GMAC, but the CATs from Kaplan,
MGMAT and Veritas are all 'close enough' to the real thing that they will provide you with a relatively realistic score assessment (assuming that you correctly take the CAT in a realistic fashion).
When you take a CAT, if your goal is to receive a realistic score assessment, then you really have to be strict about HOW you take the CAT. The more the 'CAT-taking event' deviates from what you'll face on Test Day, the more likely the score is to be inaccurate (and in most cases, that means "inflated"). As such, you should make sure to take a NEW CAT each time, with the Essay/IR sections, away from your home, at the same time of day as your Official GMAT, etc.
From what you describe, you were focused on just taking the Verbal section - so I would have to assume that you did not consider any of the other aspects of Test Day when you took this CAT. By extension, I have to assume that this result is a bit inflated. You likely have the necessary knowledge to earn that type of Score, BUT you measured your skills in a way that did not 'match up' with what you'll face when you take the Official GMAT - so we cannot assume that you will score at this same level (or higher) when you take your next, realistic CAT.
GMAT assassins aren't born, they're made,
Rich