Hi petunia
Can I ask why you are looking at school as the problem? He's 11 and he is no longer sweet and happy at home. Are you sure this is learning related or boredom related as opposed to being hormonal. 11 might be a little early but not out of the realm possibility. Or some other developmental/emotional change?

Although might be easier to navigate the gifted minefield than the hormonal minefield!

DeHe