Poor lad, that must be shitty for him. Definitely tell the school, they need to do some serious educating for a start. Where is it happening, at school or after school? If it's at school, then the teachers could be aware and "stumble across it" which would allow them to take action without it being obvious you'd spoken to them. Personally I would strongly recommend dealing with it rather than taking him out of the school. How many boys are doing the bullying? I can't imagine it's everyone, so it doesn't really matter if he is never friends with these kids, you can't be mates with everyone, school just doesn't work like that. My old man would have told me to start a fight with the hardest kid in the playground and even if (when) I'd gotten beaten up, I'd earn respect. I suggest avoiding this particular course of action! (I never took his advise by the way)