Hi 4d,
If these other 3 CAT results are relatively recent, then I'd have to assume that your current "level" is in the high-600s. What were your Scaled Scores for the Quant and Verbal sections on these CATs?
If this Kaplan CAT is a product that you paid for, then you might want to call customer service and ask about it (and perhaps lodge a complaint). If it was a *free* CAT (e.g. from a marketing event), then you could still call and ask about it, but I'm not sure what would be gained.
In the big picture, I'm curious about a few things:
1) What is your goal score?
2) When are you planning to take the Official GMAT?
3) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich