Hi rehamazazy,
I'd like to know a bit more about how you took these CATs:
1) What were your Quant and Verbal Scaled Scores on each?
2) Did you take the FULL CAT (including the Essay and IR sections)?
3) Did you have trouble finishing any of the sections on time (and did you have to guess on a bunch of questions just to finish?)?
4) Did you do anything during the CATs that you won't be allowed to do on Test Day (pause the Test, skip sections, take longer breaks, etc.)?
While a 550 is a reasonable goal, and there are many different score 'combinations' that will get you to that goal, you're going to have to put in some serious work to raise your score 160+ points in 7 weeks.
GMAT assassins aren't born, they're made,
Rich