Advantages and disadvantages of traditional review class

What are the advantages and disadvantages of traditional review classes? The advantage of this problem is 1. Simple and convenient. Teachers only need to explain the teaching materials clearly according to the progress, eliminating the tedious work process of finding materials and making courseware; 2. The economy is fast. You can attend a large class, and a class can explain a lot of content and skills; 3. Save time and trouble. Explaining the results directly can save students' groping time, but the disadvantage is 1 As the "arbiter" of knowledge, teachers have the highest authority on the "correctness" of knowledge. As the controller of students' learning, teachers strictly control teaching objectives, contents, methods, processes, results and quality evaluation, and teaching is too procedural and modular;