Harry Potter’s Raven’s Claw

　　 There was a bug. Penello should have only been in the fourth grade when Harry was in the first grade. At this time, she was not the prefect of Ravenclaw.

　　 Each Hogwarts college selected a man and a woman in the fifth grade that year, and served as the male and female prefects, and continued to hold the positions in the sixth and seventh grades. (Two in fifth grade, two in sixth grade, and two in seventh grade. After graduating from seventh grade, select two from fifth grade, and so on.)

　　 At present, I have revised the previous plot, this is just a small bug, you don't need to look at it from the beginning.