Hi neeti2711,
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 scores can become. This is one of the many reasons why you must take your CATs in a way that 'matches up' with what you'll face on Test Day (so you must take the FULL CAT - with the Essay and IR sections, at the same time of day as your Official GMAT, away from your home, etc.). Taking just the Verbal section, without the prior 3 hours of Test 'activities' before it, will NOT end with a realistic score result. You likely do have most of the necessary knowledge and skills to score higher in the Verbal section, but you have not yet properly trained to do so in the context of the FULL Test.
These two CAT scores are remarkably similar (and they're rather close to your prior Official Score), which means that you're fairly consistent in how you're handling the Exam - you do certain things consistently well, but you also make the same consistent mistakes. To score 750+, you're going to have to make some fundamental changes to how you handle BOTH the Quant and Verbal sections. To that end, you would likely find it beneficial to invest in a GMAT Course of some type (either Guided Self-Study or instructor-led).
GMAT assassins aren't born, they're made,
Rich