Deepak Mehta is a man out of time. He wanted to be born a few decades earlier, before the advent of the computer, when times were simpler and people were more content. Unfortunately, he wasn't. So, to compete in today's time, he has equipped himself with 2 degrees - one each from BITS Pilani and IIM Ahmedabad. He cracked CAT with a 100 percentile score. In his spare time, he likes to write on random website on random topics and for random people.
A lower score in the Verbal Ability section does not necessarily imply that your English is poor. While you can improve in sentence construction, proper usage of grammar etc, that is not very relevant to the CAT examination. A major portion of the Verbal section is Reading Comprehension (RC) which involves analytic skills more than dictionary-knowledge. The only trick to steer through RC is constant practice. Only when you have read the text carefully and understood what the author is trying to say, will you be able to answer the questions correctly. This means a lot of practice as there will be topics you will find dry/boring. And when you are bored while reading, you just read, you don't understand. So make yourself love every topic that can come- Politics, History, Law, Science, Philosophy etc. Do not leave the topic, however, unbearable it might be.
But at the same time, the disparity between your mock results and the actual one is too much. It most probably means that either something went wrong on the final day or you were really unlucky.
Trust me, this is very important. Get a good night's sleep, make sure that there is nothing bothering you during or before the exam.
How many hours did you put each day into the preparation?
You should not be just satisfied with your average mock scores. Strive for better results. Why not 95%ile? What's stopping you from getting 99%ile? What is so impossible about achieving 99.5%ile?
Did you review what went wrong after every mock test? Do that. It gives you a clear idea of your strengths and weaknesses. You might be absolutely sure that your answer/approach to a particular type of question is right. But it might not be. What happens then? You keep on repeating the same mistake again and again. I reiterate, CHECK YOUR ANSWERS AFTER EVERY MOCK TEST AND FIGURE OUT WHAT WENT WRONG AND WHY.
Lastly, luck also plays an important role. After all, you are judging a person's years worth of preparation with just 60 questions. Not fair! A person might cover only 50% of the syllabus and luckily get 50+ questions from that portion. Another might cover 90% of the syllabus and still get only 30 questions from that portion. NOT FAIR! So what do we do ? Simple, do not leave any scope for luck. (That might sound absurd and haughty, but that is the only way. I am not saying I completed everything. But I did cover almost all of it and was also lucky)
Complete everything. (All the booklets given by your coaching)
Some section-wise preparation tips:
And don't despair.
"The worst thing that can happen is you fail. Big deal! Get up and try again."