Grade three. According to the query of China Education Examinations Institute, the Shanghai senior high school entrance examination in 2023 covers 29 chapters contained in six math books of grades 7, 8 and 9, among which the main content of grade three is function and circle, accounting for 70%, followed by grade two, accounting for 30%, and the main content of grade three is the focus. Junior high school academic level examination, referred to as "senior high school entrance examination", is an examination to test whether junior high school students have reached junior high school academic level.