You can't. Universities in China are mainly public schools, and the entrance selection system originated from the Imperial Examination. Since 1000, it has been continuously improved to fairness, ensuring fairness and justice from the system. The person in charge of enrollment is clean-handed, conscientious, absolutely prevent the back door, ensure the quality of students, and the discipline inspection personnel are impartial and will deal with violations quickly. To sum up, it is absolutely impossible for a university to enter a good major by relationship. You can change your major through your own efforts.