That sounds like the WISC IV. I can tell you that working memory and processing speed are often limiting in young kids (there's even a measure which excludes them). processing speed can be limited by small motor issues. Perceptual reasoning is a measure of abstract thought, puzzles and the like, intelligence if you want to call it that, hopefully clear of any motor issues.
To me as an absolute amateur, it looks like he is bright, but is having problems with memory and motor skills. But knowing the name of the test you should be able to find some better info.
I found some links that might get you started
http://www.vdps.net/special/test.htmlhttp://www.ncbi.nlm.nih.gov/pubmed/21638108http://www.springerlink.com/content/w889903642j72223/Looks like it's a very common pattern in ASD as well as in gifted kids.
