I've only had one child tested with the WPPSI, but her scores changed quite a bit (over 20 points) from the WPPSI to testing with the WISC when she was 7. The later (7 years old) scores seem to line up more with what we see in terms of her academics/etc.

Would you mind telling us why he was tested? Was he being tested for a preschool program admission, was the testing prompted by a concern over something, or were you just curious about ability?

Best wishes,

polarbear