Differences: the knowledge capacity and difficulty coefficient of high school mathematics are much greater than that of junior high school. Junior high school mathematics is mainly expressed in abstract and popular language, while senior high school mathematics touches on abstract concepts at once, such as set, logic, function and space geometry, which makes it very difficult for many students who don't hate solid math foundation or poor understanding ability to learn.

Contact: The content of high school mathematics is closely related to the content of junior high school. It can be said that in junior high school, if you understand the content related to quadratic function, it is equivalent to learning 40% of senior high school mathematics. Many concepts of high school mathematics are transformed from junior high school mathematics, and sometimes they just look at the problem from another angle.