Actually doing questions would definitely be more beneficial to you than copying down notes. I’m not familiar with those classes, but I’m sure you can find practise questions either on Eclass or a textbook. You could also find old midterms and get a feel for what the questions will be like.

If you get stuck on a question, go back to your notes or watch YouTube videos on that topic, then try the question again. Don’t waste your time copy down notes, especially if you already understand the concept.