One, two, three, postgraduate entrance examination subjects, national unified topics, more related majors. Mathematics is divided into three types of papers, and different majors rely on Mathematics I, Mathematics II and Mathematics III respectively. There are several foreign languages, so is politics. But they are all unified by the country.
Subject 4 is the professional subject of the reported school, which is generally an independent proposition of each school. Because the professional textbooks are different, it is impossible to unify the topics.