I had this teacher who was openly cruel to me in front of my classmates. She didn’t even try to hide her disdain. Many years later my father told me she had a talk with him and told him: “I’d love to fail him but I can’t because he keeps scoring 10 in every exam.” So that was the reason, I never did my homework, I was always distracting my classmates but I always passed exams with a 10.