Hi Abhijit_sen,
It seems that you just had bad luck with verbal…
Sorry that it happened to you… 690 is a good score; it’s within 80% range for most of the top programs, but I can see why this may be not enough. Whether to retake, IMO, depends on the other aspects of your profile and on your school choice. If you have smth. unique or really strong in your profile, it’s better to leave it as it is and concentrate on the applications. But if not, and if your pool is highly competitive, I would advice to take it once again.
Your CAT scores show that you are very well prepared; so there’s no need to spend your time and energy on additional practice. From what I’ve read on the forums during the last months, I can say that the verbal is to a considerable degree a matter of chance. And you have good chances of scoring higher on your next attempt, especially if your practice scores in verbal were consistently in 42+ range (however, if they were not, it’s another story…).
So basically my advice would be the same as walker’s: schedule your next attempt, but don’t spend much time on your preparation, and concentrate on your essays instead.
Best of luck to you!