My 12 year old son recently took the WISC-IV and has a FSIQ of 125. He scored: VCI 132, PRI 131, WMI 129, and PSI 78. In trying to find out how we might help him with his PSI, I ran into the GAI. His GAI is 138. Are we supposed to be using the GAI as his official IQ? Nobody at the school where he was tested knows anything about this.