Hi kamrulhasan26043,
The issue that you describe impacts many GMATers - so you are not alone. It's worth noting that Verbal questions have no "safety net", so if you make a little mistake then you won't realize it (you'll just convince yourself that one of the incorrect answers is correct). Thankfully, the Verbal section is just as standardized and predictable as the Quant section is, but to score at a much higher level in the Verbal section, you really have to put more energy into paying attention to the little details and taking the proper notes.
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
1) How long ago did you take your Official GMAT?
2) How long have you studied in total? How many hours do you typically study each week?
3) What study materials have you used so far?
4) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
In a prior post, you noted that your Score Goal is 550+ and that you wanted to score a V30. However, since there are lots of different Scaled Score 'combinations' that will earn you a 550+, you do not necessarily need to score that high in the Verbal section. Are you interested in applying to a Program that requires Applicants to score at least a V30?
GMAT assassins aren't born, they're made,
Rich