I have many of the same questions that Grinity has. The IQ tests that I am familiar with are normed for certain age groups. If the child falls above or below the cut off, they can't be scored in a traditional manner. Thus, a 4 year old that is being scored against 6 year norms would most likely have the IQ number understated.

If you want to get an IQ score for him, the evaluator should utilize a test that is normed for his age.