Originally Posted by KJP
This school goes through 8th grade and allows each kid to work at their own pace with an 8:1 student/teacher ratio. There are no administrative stops on progression. He can go, go, go which is in line with his personality.
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His handwriting, attention span and work habits are all on pace with his work.
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He is fiercely competitive and wants to be the tallest, smartest, fastest, etc. We have a few types like this in the extended family and they're successful but a bit annoying.
My thoughts would be to let him progress at school according to his own will and talents... and supplement with depth/enrichment at home, according to his interests which may go beyond the offered curriculum. If his interests do not go beyond the offered curriculum, you may wish to help him develop interests, and nurture his curiosity.

And work, work, work with him on social, emotional, and interpersonal skills, including developing the grace to accept that he will not always be the tallest, smartest, fastest, etc and that he will still have intrinsic value as a human being. His ability to accept this in himself may be necessary for him to be able to truly value others.