Hi Balajikarthick1990,
With an October Test Date, you've given yourself plenty of time to study, which is good (you might not even need all of that time, since your Quant skills are already so strong). As you've probably realized, almost all of the missing points that you're looking for are going to found in the Verbal section, so you should start there and work on that section consistently during your studies.
The Verbal section of the GMAT is as predictable and standardized as the Quant section is, so you CAN train to score at a higher level. However, there are two things to remember about that section of the Test:
1) When you start the Verbal section, almost 3 hours will have already gone by and you'll be getting tired. Fatigue can have a big impact on a Test Taker's performance, so you have to work to fight that fatigue.
2) When you make a silly mistake on a Verbal question, you'll never 'catch' it (not like you might catch it on a Quant question) - you'll just choose one of the wrong answers and not realize it. Thus, you have to be very detail-oriented with your Verbal work - lots of note-taking and logical approaches to questions will be required.
Since you have some study materials and a general plan in place, you should study as you see fit for the next few weeks, then take a FULL-LENGTH CAT (including the Essay and IR sections). Once you have those scores, you should report back here; we can then track your progress and talk through any adjustments that should be made.
GMAT assassins aren't born, they're made,
Rich