Hogwarts Exam System

"Beep! The Gaokao System is now online. All examinees must strictly observe the exam rules and achieve a 100 percent admission rate to first-tier universities. Once all examinees have passed, they will be sent back to their original world as a group." "P.S. Examinees with excellent results will receive a mysterious reward from the System." Harry/Ron: "What? Why do we have to take an exam?" Hermione: "An exam? I think I can do this!" Draco/Lucius: "I refuse to study Muggle subjects!" Voldemort/Riddle: "What is the reward?" Dumbledore: "If the children pass, they can leave this place?" Grindelwald: "Actually, I think this place is quite nice..."