Teacher Zhang Yu, as a younger generation graduate tutor, has a relaxed and humorous speech, which enables many students to receive the information he teaches when listening to his class. Although they teach in different places, their original intention is to let more students enter their ideal graduate school, no matter which teacher they follow, they must stick to it.
Li Yongle, the most famous expert in linear algebra for postgraduate entrance examination in China, is now a professor at the Department of Mathematical Sciences in Tsinghua University and vice chairman of the Mathematics Research Association of Beijing Higher Education Society. He used to be the head of the national postgraduate entrance examination in Beijing, participated in the revision of the postgraduate entrance examination mathematics outline and the national mathematics examination proposition for many times, and was received by the leaders of the Ministry of Education.