Hi Jennie72 and welcome!
I'm looking for my Tech Report for the WISCIV. If you google "WISCIV Technical Report IV" it should pull it up for you. OK I found it and here is a clip but I"m not finding what I'm looking for.
Our resident score guru is AWK (away w/out keyboard) but she'll be back. In order to calculate the GAI, you need the scaled scores of the subtests for VCI and PRI.
I seem to remember you need less than 22 pt spread between VCI and PRI and a greater than 22 pt spread between VCI/PRI and WMI/PSI in order to consider GAI but I can't find where I read that. I'm not sure w/ your son's VCI and PRI spread, that looking at GAI will adequately portray him either. There is a WISCIV Excel spreadsheet I've used in looking at DS's WISCIV scores. I think the unusual spread for VCI/PRI is >20pt spread and your son's is 32 pts.
Here's the link for the spreadsheet.
http://alpha.fdu.edu/psychology/WISCIV_Index.htm
