There is an excellent course, mathematics. Hello, Mr. Li Zhen. Li Zhen: Graduated from Peking University, he has 9 years' experience in high school mathematics teaching, and was awarded the title of five-star excellent employee and S-class excellent teacher for many years. The teacher's teaching methods and hers are very useful, which will give people a sense of enlightenment. She is a good teacher who can really help children.