Hi harshagarwal004,
While
MGMAT CATs are generally regarded as a bit 'harder' than the Official GMAT, they will provide reasonably accurate score results if you use those CATs correctly.
When you took these CATs:
1) Did you take the ENTIRE CAT each time (including the Essay and IR sections)?
2) Did you take them at home?
3) Did you take them at the same time of day as your Official GMAT?
4) 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.)?
5) Did you ever take a CAT more than once? Had you seen any of the questions BEFORE you took the CAT?
As far as improving your Quant Scaled Scores, I'd like to know a bit more about your studies so far:
1) How long have you studied?
2) What materials have you used?
GMAT assassins aren't born, they're made,
Rich