Worth it. You can broaden your knowledge and learn problem-solving skills and mathematical thinking methods that you can't usually learn in class, thus activating your mathematical thinking. Although a lot of knowledge has nothing to do with the college entrance examination, it is helpful to solve the problems in the college entrance examination in the future, that is, to stand tall and see far. Of course, you still have to speak according to your actual ability. If you get good grades (in the top 20% of key middle schools) and like math and physics, you can take further studies in math or math-related majors in the future.