Hi evisa,
To start, what were your Quant and Verbal Scaled Scores on each of these CATs?
When comparing one CAT result with another, you have to look at more than just the scores/results. You also have to consider HOW you took your CATs:
When you took these CATs:
1) Did you take the ENTIRE CAT (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?
Then there are the external/lead-up factors:
1) Did you eat breakfast before taking your CATs?
2) How did you sleep the night before?
3) Were there any distractions or was there anything else on your mind when you tok these CATs?
Etc.
GMAT assassins aren't born, they're made,
Rich