The 99th %ile in the norm tables has the 2-5 math at about 260, and reading at 250. 6+ math at 290, reading 270. Though scores aren't invalidated by the software unless they're over 320, so that suggests a possible higher hard upper limit.

http://legacysupport.nwea.org/sites...202011%20Norms%20Report_01.17.2012_2.pdf

And I think we're all finding the same couple of documents out there...


...pronounced like the long vowel and first letter of the alphabet...