I'm guessing that you're looking for the novel 'Legend of the Martial God of War'. The main character, Lin Yiyu, was the son of Lin Nanyang, the head of the Lin family, one of the four great families. He was originally famous for being a good-for-nothing in the city, but later on, he picked up a ring. After devouring the physique, he began to defy the heavens and change his fate. He cheated crazily to level up and was scheming against others. One of them was being punished by the clan leader after he was found out that he had used an eraser to cheat in the exam. I hope my answer will satisfy you. Muah!