Not the right approach as classifying someone as a bully is left to someone's subjective perception. This makes caning legal in the hope it would reform those boys and leaves room for misuse. Once bullying is proven in front of PTA group then other formal methods should be used, starting with counselling-> monitoring for improvement -> separating them from their peers and moving them up seniors, that might turn the tables -> community service with final recourse being termination from school and in worst case / rarest or rare scenarios the country would already have a juvenille justice system to reform.