Here's a nice link to a bunch of detail from the publisher about the WISC-IV test:
http://www.pearsonassessments.com/HAIWEB/Cultures/en-us/Productdetail.htm?Pid=015-8979-044You can also do a Google Book search for WISC-IV. Even though the results are "limited previews," you can generally glean quite a bit of info.
And... if you still thirst for more info, let me introduce you to Dumont & Willis:
http://alpha.fdu.edu/psychology/WISCIV_Index.htmLastly, I wouldn't treat any individual sub-test result as a call for remediation -- just understand that he is stronger in some areas than others.