Hi UdayPratapSingh,
If you took those two CATs on back-to-back days - and scored V15 and V30 - then it's likely that your current 'Verbal ability' is between those two results.
"Review" is an exceptionally important part of the GMAT training process; your ability to define WHY you're getting questions wrong is essential to defining the areas that you need to work on (and the specific things that you need to 'fix'). As such, I'd like to know a bit more about your most recent CAT. While a full Mistake Tracker would provide a lot more information, there are some basic questions that you should be able to answer (and the more EXACT you can be with your answers, the better):
1) To start, what were your overall scores on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
After reviewing each section of your most recent 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