Senior one, two, three and four are classified according to different candidates for postgraduate entrance examination. Since 2009, the high number four has been cancelled (or three plus four into three). Advanced Mathematics I and II are used in science and engineering exams, including calculus, linear algebra, probability theory and mathematical statistics, with emphasis on calculus and linear algebra. However, the topic of Mathematics I is more difficult than that of Mathematics II, and it is even less difficult for economic and financial candidates, but the emphasis is on probability theory and mathematical statistics.