We tested our DC when there was a need for the scores in order to apply for a program. When tested, DD was 8 and DS was 6.

Could he take the SB? I don't think the age matters as much for this test. I don't think the WISC V has extended norms available yet...perhaps aeh or someone here can comment on the best test.

Otherwise, I agree with George.

Our tester (who had already tested DD and had used extended norms) recommended we wait until DS was 6 so that he could take the WISC IV, which had extended norms available. She ended up using extended norms for DS, so it was a good recommendation.

I don't think that reading or math abilities matter for the WISC, as it is an IQ test - so I would not worry about that. They would come into play if you decided to have him also do achievement testing, such as the WIAT. Best of luck!