Learn five required books first, and the order is required 1, 4, 5, 2 and 3 respectively. Liberal arts students are only qualified to study mathematics in humanities and social sciences colleges after they have completed the courses of 1- 1, 1-2, 3- 1 and 4-4. But you are not required to take the 3- 1 and 4-4 college entrance examinations.
Science students are only qualified to enter universities of science and engineering and economics to study mathematics after completing elective courses 2- 1, 2-2, 2-3, 3- 1, 4-4, 4-5. Elective courses 3- 1, 4-4, 4-5 do not need the college entrance examination.