Therefore, the practice of all schools now is that as long as it is within the scope of the examination syllabus, it will be regarded as a compulsory course.
For example, many textbooks take "conic curve and equation" (ellipse, hyperbola, parabola standard equation, nature and the positional relationship with straight line) as an elective course, but there is almost always a big question related to it in the exam, with a score of about 6- 12, which should not be underestimated!
However, the future examination trend may change. The current thinking is to reduce the difficulty of mathematics, lower the standard of English and increase the difficulty and scope of Chinese.
Whether you catch up with the reform or not, it is not wrong to do as the teacher asks.