Good God, am not going to watch incase I catch it!
If he is rading that grade of books, then he is flying isn't he. Its the age old problem of having no patience as the brain is so fast and effective. Tbh, in todays world, it will be an asset and I don't know if we should slow them down so they can write a paragraph about the chapter they just read. When will they ever need to? How boring to a fast bot who 'gets it'. Oh I remember the tedium of that at school
Something like chess however, would provide the need for the fast side of his comprehension to connect the the slower, carefull planning side. That might encourage care and attention in other areas.
The koreans do this so well, they play those complicated involved games that are thousands of years old. From 5!! They can listen to stories, assimilate them, and doodle beautiful drawings whilst learning a language. At the same time. Incredible.