Sharon,
I would ballpark the PG range at around a full standard deviation above the usual gifted cutoff.
I'm looking at the WISC numbers more than the WIAT here, especially because low processing speed and working memory can significantly impact fluency scores and bring down the overall achievement numbers, but they are not strongly g-loaded.
The VCI of 138 is more than half a standard deviation above the usual gifted cutoff score of 130. The PRI is even higher. It is rare to have both VCI and PRI this high, which is why the GAI is even higher than either of the subscores. The GAI, which is essentially a Full-scale IQ taking out the effect of processing speed and working memory, is 150, 1.33 standard deviations above the common gifted cutoff score. Most kids in gifted programs tend to cluster around the low 130's for the excellent reason that there are many more kids scoring there than in the high 130's, 140's, and above.
