You didn't mention his FSIQ, which may be a stronger support if you want to appeal his disqualification. I know that some people swear by GAI but in reality he does need good working memory and processing speed for certain tests and increasingly as he progresses through school. Different tests also emphasize different strengths so both could be accurate. NNAT2 is very visually oriented (matrices) so that may not be as much of a strength? I would also not place much faith on sample questions because in my experience they are always easier (sometimes much easier) than the real test. On the other hand, trust your Mommy gut and ask them to check the scantron because I do have one high ability kiddo who could have potentially mess up a scantron at that age.
