There are 5 compulsory elective courses in senior high school mathematics, 2 series for science students and 0/series for liberal arts students. Senior one requires learning 1 to 4. After half a semester, I have completed a compulsory course 5 and an elective course in Senior Two. Senior three review required course 1 learning function, including exponential function, logarithmic function and power function. Second, solid geometry and analytic geometry. I think the most difficult things to learn are three algorithms, statistics and probability, four trigonometric functions and plane vectors.