The working memory caught my eye as a difference. 126 is a very good working memory score, but 146 seems like a major academic advantage (in my opinion).
If you suspect something is off, I think you may need a full evaluation (neuropsych) to get to the bottom of a learning or global issue like ADHD. An office visit with a psychologist without formal testing can be a waste of time if the issues are moderate and the IQ is helping to compensate for learning issues- everyone said my DS did not have ADHD until he had a neuropsych which confirmed that he does. It also picked up some weaknesses in language and working memory that the WISC did not- WMI and language are apparently complicated and abilities can be highly variable depending on the context.
Just my thoughts.
