Score-Controlling Academic Master

In an urgent math exam, although the monitor, an academic master, only scored 50 points, the school beauty only scored 30 points, and the class representative and study committee member scored even lower. However, unexpectedly, Hao Nan, who often fell asleep in class and was an expert in the cafeteria who focused on eating, ranked first with an astonishing 90 points? The math teacher couldn't help but said: "Hao Nan, you really succeeded unexpectedly this time." The beautiful class teacher smiled and said: "Is it time to share your secret?" Other students said one after another: "Hao Nan, are you hiding your ability to be a top student?" Hao Nan waved his hand modestly: "Don't get me wrong, I am not a top student, I just used some special strategies to control my grades!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.