Internet high school isn't that bad of an idea. Afterall it wouldn't be around if it were. I think you and/or your parents should talk to him about it first though, because once he starts getting into it, he most likely would be too scared to go back to normal high school. Also, private schools can be tough on a person. Maybe he just needs advice on how to get along with people. How much older are you from him, are you still in school?
-Audrey