Fight My Battles

With 1 normal year 6 class, 1 normal summer festival and 1 normal storm, what could possibly go wrong? Oh, and there's an evil mastermind on the loose.
Every century, one pupil is chosen to have a very hard year 6. If they stay strong through all the struggles and the being tormented by the teachers, they get special powers. And these powers are used to stop the biggest struggle of all...