Hehe, it is not easy to get a classmate video in a big classroom, but a teacher can talk a lot there. I don't know your major,

1. You can go to Xunlei to search, first look at what courses you have in this major, and then search the course name.

2. Or go to official website, a famous school, and some have it.

Step 3 try bt

4. Find a website dedicated to downloading courseware (some charge nnd), hehe.

Looks like a good kid. Study hard. Don't be too stressed, just learn the backbone well, maybe you can learn one (personal opinion) well. Chairman Mao said that people's energy is limited!

Wish you success!