Not bad. The course of Chalk Wang Jiyan covers many fields, such as natural science, social science, humanities and arts, among which mathematics and physics are the main subjects. His courses focus on teaching methods and practice, aiming to stimulate students' interest, help them build up their self-confidence, master learning methods and achieve better results. Chalk Wang Jiyan is a senior educator who has taught in famous universities such as Peking University, and has a wide influence and reputation in the education industry.