How did Arthur escape from the industrial school?

Arthur escaped from the industrial school by cleverly devising a plan that involved befriending a group of older boys who had more freedom. He waited for an opportune moment when the guards were distracted, then slipped out through a poorly secured exit. Utilizing his knowledge of the school's layout, he navigated through the surrounding area until he was far enough away to avoid being caught. His determination and resourcefulness ultimately allowed him to regain his freedom.