I would email your tester and inquire if ceilings were hit and with which subtests.
Yes, score interpretation is best done by qualified professionals who've observed your child's testing. Interested parents who wish to acquaint themselves with general background information in preparation for discussion with their professional may conduct a websearch to find and read information in source documents found online and freely accessible to all, such as the WISC-IV Technical Report #4 General Ability Index dated January 2005 by Susan E.Raiford, Ph.D. Lawrence G.Weiss, Ph.D. Eric Rolfhus, Ph.D. Diane Coalson, Ph.D., and updated December 2008. This 20-page technical report states on page 3:
It is important for practitioners to recognize that the GAI is not necessarily a more valid estimate of overall cognitive ability than the FSIQ. Working memory and processing speed are vital to the comprehensive evaluation of cognitive ability, and excluding these abilities from the evaluation can be misleading.
and on page 17:
The GAI provides important information regarding a child’s cognitive functioning, but it should never be interpreted in isolation.
While referring practioners to their extensive score interpretation manuals for guidance, the technical report provides tables for assessing differences between predicted achievement scores and actual achievement scores for discrepancy analysis. Tables do not describe predicting GAI based on achievement scores.
