There are four grades of learning and thinking in the supernormal grade, namely, sensitive class, diligent thinking class, Stoban class and ordinary class, which are respectively improved class, top class, supernormal class and basic class, among which Stoban is the third supernormal class. The class leader of learning and thinking is mainly aimed at students who have achieved excellent results in mathematics at school and have been exposed to a certain number of Olympiads, but have not learned much.