Hi sudtiwari,
With your current timeline, you plan to take the GMAT in less than 4 weeks. Unfortunately, raising a 550 to a 700+ in that time is not a realistic goal. You will likely need at least another 2-3 months of consistent, guided study to hit your score goal. In addition, it's unclear how big a factor your performance on SCs is to your total score, so I have a few questions about your performance on each of the CATs that you've taken:
When you took your CATs:
1) How many CATs have you taken?
2) How did you score on each CAT (including the exact Quant and Verbal Scaled Scores)?
3) Did you take the ENTIRE CAT each time (including the Essay and IR sections)?
4) Did you take them at home?
5) Did you take them at the same time of day?
6) Did you ever do ANYTHING during your CATs that you couldn't do on Test Day (pause the CAT, skip sections, take longer breaks, etc.)?
7) Did you ever take a CAT more than once? Had you seen any of the questions BEFORE?
Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level.
GMAT assassins aren't born, they're made,
Rich