Sorry, let me clarify: The SB5 (Stanford-Binet, 5th ed) is an IQ test that your son did *not* have. The psych. used the WISC-4 as an IQ test. The subtests that were lowest on the WISC-4 were ones that that require writing symbols with a pencil. Since, as you say, he has a "deficit in writing", perhaps he should take the SB5 IQ test next time, since it does not require as much quick paper and pencil work.