Hi Bsquared94,
I'm sorry to hear that Test Day didn't go as well as hoped. From what you describe, your studies were inconsistent - and that would have impacted your retention of the material and how you performed on Test Day. In addition, the process of taking (and reviewing) a CAT requires a significant amount of energy and effort - and takes time to 'recover' from. This is one of the reasons why you typically shouldn't take more than 1 CAT per week. By taking two CATs right before you took the Official GMAT, there's a reasonable chance that you experienced some 'burn out' on Test Day.
Before you take any 'next steps' (such as switching to a different Exam), it would help if you could provide a bit more information on how you've been studying and your goals:
1) Have you used any other study materials besides the OG?
2) What is your goal score?
3) When are you planning to apply to Business School?
4) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich