Medium. Self-enrollment in Shantou and Jinzhong is an important measure to expand the autonomy of colleges and universities in China's higher education enrollment reform, which means that colleges and universities in Chinese mainland can self-enroll, which is different from unified enrollment in the college entrance examination. Self-enrollment selection is organized by colleges and universities, and generally consists of two parts: written examination and interview. Mathematics examination has been a medium question for many years, so long as the basic knowledge is well mastered, there is no problem.