Mathematics in Shanghai Senior Two is the most difficult stage, with the most knowledge points. At the same time, the academic pressure of the second year of high school is great, and I have to take the grade examination of the plus three subjects.

Now it's winter vacation. I suggest you find a tutor to sort out the contents of last semester, and find a reliable image number/theory/transformation, new/king/brand, especially solid geometry and conic curve. These are the difficulties of senior two. It's better to review and sort them out in winter vacation.