Bullying in school

I am a teacher in a middle school. I teach 6th, 7th, and 8th classes. My working place is a village. People are divided, so, the children. One student, A, dominates other student B demanding B to complete all A's writing works. Bullying is a major issue. Groupism among students is also found problem creating. What should I do? Is there any kind of tactics to solve this issue? Or any previous incidents to take as an example



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