Hi Irene,
I'm a school psychologist and give the coding subtest on a daily basis. I know exactly what you are talking about. The coding portion of the WISC-IV has instrcutions that must be read before administering. These state explicitly to the student that they have to fill in each box in order and can't skip any. I'm assumming your son probably tried to do all of a certain number first and then went back and tried to do all of another certain number next. As part of the standardization of the test, it must be administered exactly how it was administered when it was originally produced, which included telling each student that they have to go in order. If he were to skip ahead and do each number all at once, when the time stopped he would have had all of the blanks between the last number filled on teh page and the beginning marked incorrect. It sounds to me like the psych did their job.
