In fact, CUHK's major in mathematics is far superior to that in physics, and there is another Zhu Xiping in the field of mathematics. In fact, I think I have made money by entering mathematics. Every year, CUHK has students who have graduated from mathematics to study for graduate students majoring in finance, and they are very popular. When I changed my major in my freshman year, most of them changed their major to mathematics, and many of them changed their major to science and engineering. Actually, it's quite a loss to change majors. For example, the department of mathematics and the department of physics seem to need 1 year. However, if you major in material physics, you may not have to reread it in your freshman year. Your freshman class should be the same. Changing majors requires freshmen to have a high grade point last semester. Work hard and don't slack off. It should be no problem. After all, science, engineering and mathematics are not hot majors.