From what i read of the CogAT, it's not hard for kids to hit a ceiling on it and get all of the questions correct, esp. if they are given the level for their grade rather than an advanced level. For instance DD took it in second grade but was given the third grade version, which the test manufacturers actually recommend so that the school can find the kids who are actually "gifted". DYS is looking for scores above the 99.9th percentile and I'm not sure the CogAT even breaks it down that way.
Sounds like you should take the WASI and figure out how to get those two additional sub-tests and turn it into a WISC GAI. Maybe the school psych would be willing to do those two extra tests or you could take the school WASI to someone independent and just pay for 2 subtests and a "conversion" if possible? If the school gives you or her/him the raw scores, they should be able to do that. I have all the raw scores from DD's WISC, I just asked for her to make a copy of the handwritten score sheet. The WASI probably has a similar sheet.
