Simply said, I tend to agree with dusty, Val, and puffin... who seem to value obtaining and understanding test results.

To that end, this describes the calculation of General Ability Index (GAI), as seen in The What, When, and How of the Wechsler General Ability Index (copyright 2007, updated to include citations/references to sources dated 2009):
Originally Posted by brief excerpts from Pearson document, available to the public online
• The GAI provides an estimate of general intellectual ability, with reduced emphasis on working memory and processing speed relative to the FSIQ.
• Theoretically, the GAI represents an individual’s overall cognitive ability, if working memory and processing speed abilities were similar to verbal and non-verbal abilities
...
Some clinical conditions (e.g., Learning Disorders, memory issues)
- Working Memory and/or Processing Speed subtest performance more likely to be lowered
– Results:
• lower FSIQ score
• mask actual differences b/w cognitive ability and other scores

GAI comparison gives a different perspective, different results
– Cognitive potential vs. memory or vs. achievement: how might this discrepancy be different if the clinical problem were treated successfully?
...
– With rare exceptions (motor impairment, invalid FSIQ score), the GAI is not a substitute for the FSIQ
– FSIQ more comprehensive; Working memory and processing speed are integral aspects of general intelligence
emphasis added

Some kiddos can be compensating for their weaknesses by utilizing their strengths. Others may be taught to compensate.