Hello, math is an elective course 2- 1, 2-2, 2-3. Physics elective courses 3- 1, 3-2, of which 3-3, 3-4 and 3-5 are 1. Elective Chemistry Course 4 (Principles of Chemical Reaction) is compulsory, and elective courses 2, 3 and 5 are 1. Biology chooses 1 in elective course 1 and elective course 3. I hope I can help you.