Generally speaking, Ph.D. in Mathematics at Peking University can only teach in ordinary colleges and universities, and the salary is not high, 4W a year. Even if there is a project, it will be 10W at most, which is only a few people. Moreover, the mathematics of graduate students is extremely difficult, much more difficult than that of universities. You will regret taking the math postgraduate exam, and you won't be able to study for half a year. Unless you are one of the top 20 talents in China, you should give up the idea of taking the math postgraduate exam. Take an examination of your computer graduate student. Salary is much more promising than mathematics. I am a graduate student majoring in mathematics.