The best thing I can recommend is to “do them” again.
Ik Ik what the fuck ew.
But believe me, nothing beats rewriting the notes by hand again and thinking about them while you’re doing it. Why is this stuff important? What are some tie backs you can recall on for this concept? Any funny ideas you came up with that might help you to remember it?
Then, to add another layer, I digitize my notes with Obsidian. It’s a markdown note book that lets you tag stuff and then you can view a graph of the connected pages via the tags you tossed on each one to breeze through notes fast (great for doctorates and heavy degrees, or just stuff you plan on adding onto as time goes on.
It’s all about reanalyzing the material through different ways and angles. Writing stuff down seems to click better for most humans for some reason. You can also try finding some good YouTube content on the material and try challenge problems frequently. Don’t let failing scare you, analyze your failures and study yourself. Getting through school is just as much about learning the material as it is learning about yourself and how you beat perform and learn.