How many elective courses in senior high school mathematics are there in the latest People's Education Edition?
In the college entrance examination syllabus, there are 1 compulsory courses: elective courses 1- 1,1-2; ② Science: Elective courses 2- 1, 2-2, 2-3; Generally speaking, there must be elective courses 4- 1, 4-4, 4-5, but 4-2 is not necessarily available (in different places).