We recently had our son tested using the WISC V because of some questions we had about schooling (Our district canceled GATE so we tested on our own). We anticipated his high verbal scores (133 on comprehension and 140 on the expanded crystallized) but were surprised to find he is relatively low in others which, according to the doctor, may be indicative of a learning disability/ issue. In particular, within three composite sections he scored high on one subtest and noticeably low in the other subtest. He also scored relatively low on both subtests in working memory. His scores are:

Verbal Comprehension
Similarities 15/95% / very high
Vocabulary 17/99%/ extremely high
Information 19/ 99.9/ extremely high
Comprehension 16/98/ extremely high

Visual Spatial
Block Design - 12/ 75%/ high average
Visual Puzzles - 15/ 95%/ very high

Fluid Reasoning
Matrix Reasoning- 6/ 9%/ Average
Figure Weights- 14/91%/very high

Processing
Coding 11/63%/ Average
Symbol Search 15/95% very high.

Working Memory
Digit Span 8/25%/ Average
Picture Span 9/37%/Average

We are following up with the doctor who performed the testing as she is concerned about the discrepancy in scores. In the meantime, I've done some research about poor working memory but am stumped as to why there would be such a discrepancy between subtest scores. Any ideas?

Thanks!