Not easy to test. The postgraduate exam of north university of china Mathematics Department is very difficult, with great competitive pressure and a large number of applicants, so it is not easy to take the exam. North university of china is a multidisciplinary teaching and research university jointly established by the Shanxi Provincial People's Government, the Ministry of Industry and Information Technology, the Shanxi Provincial People's Government and the National Bureau of Science, Technology and Industry for National Defense, and managed by the Shanxi Provincial People's Government.