DS has had two IQ tests, two years apart and they are both very spiky. He has HFA. In both cases, the testers said that the full scale score was not reliable. It was 111 on the first WISC and 126 on the second WISC. The first tester thought that his score on the matrices subtest was the most indicative of his "true" IQ.
I think the WISC underestimates my child's actual abilities. Two years after starting therapy, DS took the COGAT. He had been grade accelerated one year, so we had scores compared to his age group and scores compared to his grade level. His overall age-matched percentile was 97%, with 99% in math. His grade-matched percentile was 93% with 99% in math.
