I thought it was something like a 162. Not sure, but a 164 ought to do it. 90th % sounds accurate.
I actually went through the audition, and got selected. It was pretty easy, but if you want any tips or ideas just ask. You do something like 20 hours total of training for which you get paid $7 an hour, but then the tutoring or lecturing you get paid really, really well. I heard something in the range of $20-27 an hour, more for one-on-one tutoring.
Unfortunately, I found out soon after that being an AmeriCorps VISTA precludes you from having any outside employment.
(We're trying to get people to move themselves out of poverty, but aren't allowed to do so ourselves, I suppose.) So unless kaplan is sneaky enough to pay me under the table, I will unfortunately have to limit my kaplan tutoring experience to the audition.