HP: I want to leave school, but I saved the world

Travel through the HP world and start with Slytherin. But Jian Yu realized there would be a war in this world in seven years, with countless casualties. To survive, she decided to drop out of school and return to the Muggle world. It's not easy to go to school, but it's not easy to drop out. But she discovered that it wasn't easy. When she broke several school rules, the teachers gave her absurd extra points. When she deducted college points like crazy, her classmates admired her even more. When she tried to distance herself from the protagonists, they became attached to her. Seven years later, the leader of the wizarding world...

the story is not mine this is just a translation, English and Chinese are not my first language so I will be using Grammly
the original title: HP：只想退学的我却拯救全世界