Welcome Brownd, so glad you are here!

Yup, you can calculate the GAI from the subsection scores.

Here are some useful threads:
http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/128129/1.html

When the WISC-IV is used for the identification of gifted students, either the General Ability Index (GAI), which emphasizes reasoning ability, or the Full Scale IQ Score (FSIQ), should be acceptable for selection to gifted programs. The GAI should be derived using the table provided in Technical Report #4, available at http://www.pearsonassessments.com/N...DA-05888C7CC082/0/80720_WISCIV_Hr_r4.pdf or through a search for “WISC-IV GAI.” ).

But the main question is - what was the cause of the 3 years of frustration, and how are the test scores going to help you help other make changes so that the causes of the frustrations will be addressed?

The only number I've seen school folks be impressed by is College Board's SAT, BTW. Advocacy is important, but difficult.

Best Wishes,
Grinity

Coaching available, at SchoolSuccessSolutions.com