This mainly depends on your own ability and learning situation, as well as the corresponding classes selected in the early stage. The strength of the class is also one of your comprehensive considerations. Suggestions: First, listen to the courses of the corresponding institutions in the early stage and have no money to understand. Second, choose your favorite teaching method, face-to-face teaching or video, and you can learn well if you are interested. Third, know whether your course can bear it. Now some classes are specially designed for college students. Combined with one's own comprehensive consideration