2, learning and thinking cheats high school is worth buying.

3. The new version of "Learn and Think Cheats" divides senior high school 1-3 grades into 12 grades, with 20 lectures per year, 6 methods+13 questions for each lecture and 25 teaching videos. Children can practice every semester, every month, every week and every day according to this system, which is suitable for every child who wants to make a breakthrough in mathematics.