Hi velaemilio2,
Since your GMAT appointment is in less than 1 week, it's too late to reschedule it. However, you can still use it as a great 'learning experience' and if you end up taking the GMAT again, then you can use your knowledge/experience of Test Day to better plan for that next attempt. Since this is your first post, I'd like to know a bit more about your studies and goals:
1) How long did you study with each of the 3 Courses that you've mentioned?
2) Are these the only 3 CATs that you've taken during your studies? If so, then on what dates did you take each Exam?
3) Did you take the FULL CAT each time (with the Essay and IR sections)?
4) During this CAT, did you have to 'rush' to finish any of the sections (and if you did, then how many questions did you rush through?)?
5) What is your goal score?
Regardless of how you score this Saturday, the GMAT is the same consistent, predictable Exam that it's always been, so you CAN train to score at a higher level.
GMAT assassins aren't born, they're made,
Rich