Exercise class is an important form of junior high school mathematics classroom teaching, but now many teachers pay insufficient attention to it, which affects the teaching quality and effect of exercise class and students' interest in learning mathematics. In fact, the exercise class is an important form to deepen the understanding of mathematical knowledge, check and fill gaps, open up ideas and improve abilities. In the classroom organization design, we should be fully prepared like a new class, and grasp three links: preparation before class, feedback during class and homework, so as to really improve the effectiveness of the exercise class. First, fully prepare before class 1. Pay attention to homework correction and understand the "crux". Teachers should pay attention to the correction of daily classroom homework and extracurricular homework, record students' homework in detail, especially the typical mistakes that students make in the learning process, and make statistics and classification of students' homework to learn more about students' mastery of this chapter, learning habits and learning methods. Only by mastering the consolidation of students' knowledge can teachers adjust in time and check for leaks and fill vacancies. 2. Seriously analyze the problems and determine the teaching objectives. Teachers should carefully analyze students' mistakes and the reasons for them. Analyze whether the reason for students' mistakes is intellectual error or method error, whether they will make mistakes or not at all. Analyze students' habits and attitudes in doing problems. According to the results of the analysis, the teaching objectives of the exercise class are clarified, including the knowledge and skills learned, the process and methods of answering questions.