1.) If you took the Kaplan course, then perhaps you did score in the 90th percentile on one of your practice exams. So, they could have contacted you based on that -- not necessarily on your actual test.
2.) In terms of us not hiring, don't listen to rumors on these boards. We wouldn't waste the time or the money running auditions and interviews if we had no intention of hiring people. If you have concenrs, call the local center and as them. They'll be honest with you.
3.) As for the audition, the audition is meant primarily as an opportunity to meet applicants and make sure they don't seem unnaturally uncomfortable talking in front of a group. So, the audition is meant to be done on any non-test subject (e.g., how to solve a crossword puzzle or how to take great pictures). In Julie's defense, we have seen people audition with how to play a chord on a guitar. Of course, our center has now banned props from auditions, but that's another story entirely.
If you have any questions about working for Kaplan, feel free to PM me. I've been with them for over five years now and I truly enjoy the experience.