I was looking through the CTY stuff. I'm not able to find any reference to percentile requirements on the eligibility page for CTY Online. It shows qualifying scores.
http://cty.jhu.edu/ctyonline/apply/eligibility.html#EligiblityGuidelinesI think the percentile reported also depends on whether it is reporting from the above grade level norms or comparing to his grade group. In either case the percent has a completely different meaning than a percentile score on an IQ test (which is based on the population of testers at your kid's age.)
If you are looking at a percentile for above grade, then you need to take the raw score itself (something in the 400s range) and compare it to a chart to get the percent amongst other kids the same grade
who also are likely gifted and took the same test. Taking the percent reported in the OP for math (59%) and looking at the Grade 2 boys chart for 2012 (
http://cty.jhu.edu/talent/docs/test%20data%20scat/2012SCAT.pdf ) I see that corresponds to about a 435 which is the eligibility score listed for math on the CTY Online link.
