First, online classes can only see the teachers on the video. Unlike a real classroom, there will be teachers in charge of discipline. I can't be self-disciplined and easily distracted, so my study is not solid enough.

Second, the online class time is limited, and the teacher will selectively teach the things in the book, which will be more concise in his own language and content, so you will feel that you have omitted a lot and will be different from the real class.

Third, the knowledge teachers who study in the classroom will emphasize it many times to deepen your impression of learning.

These are different from your online classes. But don't worry, in addition to strengthening your self-discipline study, the teacher will also help you learn knowledge when you start school later.