I feel for you and we could easily wind up in the same situation with our youngest DYS at school in the next couple of years. DYS DD9 tested into the G&T program at school easily, but the school has its own gauntlet of tests and it is easy to see how an anxious kiddo could fail to make it through this many tests well (even bright kiddos have a bad day sometimes, right?). Still, our G&T program has an appeal process (which we were lucky to not have to use...yet).

madeintheuk, I am sending you a PM.

If his 504 plan was violated that would seem BIG in my book.

I don't know much about the NNAT, but I am extremely familiar with NWEA MAP. Does he have a "NWEA score history" that can show evidence of high scores from a multitude of administrations? If so, I believe that this is strong evidence of achievement. In terms of ability and IQ, I believe that WISC and SB are the "gold standard" here, aren't they? Can DYS help you find some literature to support the use of the test scores you have as extremely relevant to your DS's qualifications for the program?