Training courses are usually more than one month or two months, and most of them attend classes on Saturday and Sunday, so the actual class time is not very tight and the learning atmosphere is not very good. Personally, I feel the foundation is better. I went to Baidu C exam question bank to hold a book, which is really different from the learning resources of the students in the training class. I also thought about enrolling in classes, and finally chose self-study. To tell the truth, the learning atmosphere in the school is not very good, and most of the students who applied for classes failed me. If you are going to live on C, you'd better take heart.