I'm so sorry, vicam! I teach one like that - a GT identified graduating (well, he might not graduate) National Merit semi-finalist who reads Latin fluently but is failing everything (except Latin). He loves to learn but hates anything he perceives as busy work. It's heartbreaking.

DD12, 7th. Dx'd ADHD/GAD. No IQ test. EXPLORE & SAT just miss DYS but suspect HG+