Hi arielo,
Many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' scores. Based on your answer, it's unclear how long you've actually been studying (it's in the range of 1.5 to 2.5 months) and how consistently you've studied during that time. If you've been studying for less than 2 months, then you might naturally improve over time. If it's closer to 2.5 months though, then "your way" of studying might not lead to any significant improvement.
With your current Test Date, you have about 4 weeks of study time remaining - and you could certainly pick up the necessary points in that time to hit your score goal. However, you'll have to make some significant changes to how you 'see' (and respond to) this Test, which will mean that you'll need to focus on learning and practicing some new Tactics.
I have a few questions about how 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?
GMAT assassins aren't born, they're made,
Rich