L.G.
Have you talked with his teacher about how she sees him responding to his school? What is he like when he's at school, in her opinion?
Maybe he is bored in school, or doesn't feel cared about there? Those
In that case, maybe a school that is more stimulating, has more to do, is more challenging, and/or more caring, would be right for him.
What kinds of things does he like to do at home? Does he like to look at books, make things, tell stories, be read to, take things apart to see how they work? If he likes to do those things at home, maybe you can ask his teacher to do those things with him at school. If he/she is not OK with that, then maybe he needs to be in another school.
Hope this helps!
L.