Hi virendermidha,
The extra information that you've provided is quite helpful. You've been studying a certain way for 5 months now (primarily "self-taught" with books) and during that time you've developed a series of "habits" (some of them good, some of them bad - this is why your CAT/Scaled scores are so close together). As such, you need time to learn some new tactics AND get out of all of the "bad habits" you've developed over the last 5 months. That's going to be tough to do in less than 2 weeks; as such, any extra time that you can put towards this process (by pushing back your Test Date) would be helpful.
After seeing the Scaled Scores on your CATs, I have a few follow-up questions:
1) Do you have a pacing problem in any section of the GMAT?
2) Do you ever finish early in a section or do you have to rush through a bunch of questions at the end of a section (and if so, then how many?)? Do you ever leave questions unanswered because you run out of time?
The GMAT is a predictable, standardized Exam, so you can absolutely train to score at a higher level. Right now, "your way" of doing things puts you in the low-600s, so you'll probably have to invest in some new resources, AND really practice some new tactics, to improve these scores in a short period of time.
GMAT assassins aren't born, they're made,
Rich