At present, there are only two ways to do this. One is to listen to the course playback, take the time to study, and make up the lessons that you didn't listen to before. The other is to look at the textbook, and the teacher will lecture around the textbook.

So you can read the textbook directly, draw the key points, remember to take notes and sort out the key points, which may be faster than reading the course, but you need more patience and understanding.