I'm too old to have done this when I went through school, but I suspect a good practice is to go through your syllabus, and but the major unit covered into the

I'm too old to have done this when I went through school, but I suspect a good practice is to go through your syllabus, and but the major unit covered into the youtube search bar. I suspect you get all sorts of parallel presentations of the material in a way that is quite helpful for retention.