Passed the practice exams... now ready for the real thing?

I've studied using the 3 study guides while also using my own materials. I've taken the practice exams from the diagnostics kit 2 times each and passed every time in the 430 - 460 range.

For those that have taken the test, would you say that those scores would be sufficient to pass the real exams?

Basically what I am asking is if the real exams are harder than the practice exams and if I might expect about the same or lower scores on the actual tests.

Are the practice tests comparable to the actual tests?

Thanks,
Woody