Your experience is not unusual. On one hand, teachers may be "too busy" due to the common practice of placing students with a broad range of abilities in a classroom.

On the other hand, is it possible that there is a vast difference in your child's attending to things which interest him (as seen in his interactions in daily life outside of the classroom... chats in the grocery store... functioning on sports team, etc) and attending to tasks which he is required to do on demand in the classroom?

aeh made such a good point in this recent post.

When attending to high-interest topics his gifts may shine, but when required to shift to and focus on low-interest topics... possibly a difficulty with regulating attention masks his gifts?

That being said, I'm glad you had him tested and have results which may help you understand, raise, and advocate for your child. smile