I honestly don't think taking notes is a good use of my time. I drill existing flashcards for the most important things (e.g. common flaws), but the rest is very strategy-based and you'll see things come up in explanations to questions you got wrong. Every 5 minutes spent taking notes is 5 minutes I could have been doing practice problems, and answering questions/reviewing the strategies in practice is a much better use of my time imo