Such teaching videos are expensive and hard to find. I suggest you go to Yi Life. Although there is no systematic teaching, there are some simple live learning videos.

And it's completely unnecessary Shi Si high school should not have a full set of learning videos. You can search some teaching videos in Baidu, or download a relaxed live broadcast software with your mobile phone. The above video resources are very rich.

There are many videos about teaching. You can watch them, and you can interact with the anchor by typing and praising them on the screen. You can also open your own live broadcast room. What problems can I help you solve? This is a very practical software.