If a child has a IQ score of 140. and the GAI is 146. ...I would like to show these references to the school as starting point. But how do I address the 5 points.
Have you applied to DYS for him? Maybe they can do the explaining for you & it might hold more weight coming from someone other than the parent, unfortunately. We've had terribly obtuse GT coordinators at times & wonderful ones at others. The less helpful or less knowledgable ones seemed to be more interested in hearing from people other than me such as school GT teachers, psychs, etc.
When dd#1 was being evaluated to skip a grade (at the school's recommendation), the GT coordinator for the district looked over the breakdown of her IQ scores and stated that dd wasn't really gifted b/c she was really only gifted in one area (the one part of the PRI index where she got a 19+/99.9 percentile). Apparently, all of the subtests other than PSI being in the upper 90s, the total score being at the 98th, and the various other 98th and 99th percentile scores w/in subtests didn't register as gifted with her.