Close one, I thing the purpose of bully does not make one person evil, if it serves as an educational purpose to serve ones medicine back to them and allows both parties the chance for aments, forgiveness and heal. If one walks the path of revenge for purpose to inflicting pain, better dig a whole for everyone involved. Like the great bible of revenge the Count of Monte Cristo, book has one story, the films, made more ending, with far less complex plots and twists and a question if one has gone too far. One is clear, revenge is easy with dedication and resources. The hard part is understanding each person and motives, the book is a masterpiece to understand that, so maybe you get a path to walk out with the ones that can face the truth and forgive, like in the last movie with Jim Caviezel and Henry Cavill, for those who are fixed on past love, the book is still my preferred outcome and a more realistic one at that with final words: "l'humaine sagesse était tout entière dans ces deux mots: attendre et espérer!" ("all human wisdom is contained in these two words, 'Wait and Hope'".
So MC, just take Amber, change school and go abroad, never have to deal with the politics and anything connected to them again. Heal, love, wait and hope. The end, happy ending.