I'm not a WISC-IV expert but if DD7 answered all of the block design questions correctly that would put his block design score at 25 using the extended norms (the score varies based on age -- this is the max score for a seven year old) He would be in at least the 99.9 percentile in this area.
On our report, the psychologist gave us scores for the four subtests:
verbal comprehension (VC),
perceptual reasoning (PR),
working memory (WM), and
processing speed (PS) and a
full scale IQ (FSIQ).
She also gave us the individual test scores which helped when she failed to calculate the extended norms. Block design is one component of the PR score. Our report also included a GAI score which is a combination of the VC and PR scores. This number can be useful if you have a 2e kid who has memory or processing issues.
Here is a link to the extended norms technical report:
http://www.pearsonassessments.com/N...C-8E4A114F7E1F/0/WISCIV_TechReport_7.pdf
Hope this helps!