Or, if you receive a video of junior high school mathematics, Chinese or other subjects on Taobao, Taobao has bought the link and then downloaded it yourself. You have bought all junior high school courses in Huanggang Middle School in Taobao before, and the link is only a few dollars. It takes time to download, but it is very cost-effective! My friend's children used this video. This year's college entrance examination scored more than 550 points in liberal arts. Children have difficulties at home and have no money to make up classes, so they rely on video to teach themselves. You try!