Hi krutik123,
These CAT scores essentially show that you're 'relatively close' to your score goal, but you can't seem to hit it. Taking more CATs is not going to provide the solution that you're looking for though (you'll likely continue to score in the same general range). While the 'blocks' of CATs available from Kaplan and Veritas should suit your needs, it would be a mistake to focus on taking lots of additional CATs before your Official GMAT.
Right now, you're making just enough little mistakes to keep you from hitting your score goal. At your current scoring level, the GMAT becomes really 'sensitive' to little mistakes - if you make too many, then a 740+ becomes impossible to achieve. Thus, you really have to do some 'nitpick' analysis of your recent CAT scores to determine WHY you're getting questions wrong.
On your last CAT, how many questions did you get wrong that you SHOULD/COULD have gotten correct? Can you define WHY you missed the question? Improving those little areas is what is essential - increasing the precision in your physical test-taking 'work' is what will take your score to the next level.
What materials have you been using during your studies?
GMAT assassins aren't born, they're made,
Rich