shadow teacher with student

Ladies with a specialty in behavioral therapy, we are looking for a shadow teacher for a ten-year-old child to be with him in school. He does not suffer from organic diseases, is gentle, calm and tidy. The problem is recurring habits such as the type of food and focusing on one task such as watching YouTube for long hours. We know that this is wrong, but we could not change the behavior by prohibiting it. He also does not like to play, is very active, does not care about studying and does not fo