Harry only said he would come to Hogwarts he doesn't have to be nice. He can make his headmasters life and the other teacher's life a living hell. And any detentions Harry gets he can choose to attend them or not. He doesn't have to go to classes. After all the Headmaster wants him there, he won't be expelled no mater what he does. And he can spend his time in the library to find a way to protect himself even more and to get away from the headmaster. Does he have enough to buy the Daily Prophet? And must Harry do away with his muggle subjects. Can Harry not learn in his free time and take tests like home schooled children?