My understanding is that the percentiles DO compare the student to the norming sample of regular kids, two-years ahead of the student, and NOT to the talent search participants of the same grade. This raises the interesting question of when the test was last normed. I suspect that this may be part of the cause for the excessively high percentiles. At least in math, many subjects are now covered (at least superficially at an earlier grade level).
Also, while they don't have percentiles comparing the student to the other CTY talent search participants of the same grade level, you could sort of figure it out from the charts. This wouldn't be completely accurate, however, because the charts are for the CTY talent search participants from a PREVIOUS year. Still, it would give you a general idea of where they would fall.
And please, everyone, correct me if I'm wrong about this stuff.
