Hi Abelthomas,
I'm sorry to hear that Test Day didn't go as well as planned. these types of score drops occur, the two likely "causes" involve either something that was unrealistic during practice or something that was surprising (or not accounted for) on Test Day. If you can answer a few questions, then we should be able to figure this out:
When you took your 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?
Beyond the answers to these questions, I'd also like to know more about your studies so far and your overall goals:
1) What materials have you used?
2) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
3) What is your goal score?
4) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich