Best solution is to make his own gang. Find the strong kids from other places and bribe them with food or stuffs you have. Make them close. Also be part of the sports and karate team. Then nobody will bully you. When I was young I was not constantly bullied but was bullied sometime. Then the feeling of getting strong came to my mind. Then I started working out and becoming strong. As long as you are strong, nobody dares to touch you. Plus you need to be good at school and help those fellow low grades with school. All the issues will be solved.