I was one of top math students in primary school. In secondary school I barely kept up with writing down stuff from blackboard, even less so at university. I just got by.
Now I learn at home using textbooks, solving exercises, programming and using online materials. I'm much happier now because I can spend as much time as I want until I feel I understand it.
My answer: don't take much notes. Write down only the main topics and unusual conclusions. There's not enough time at classroom so I need to learn at home anyway. If I were to go to university again, I would write down only a rough roadmap. Keep the best textbooks, exercise books and learning materials. They are like systematic notes, but better. For math it's good to have a topic covered by more than 1 textbook, because rarely an author has the same thinking pattern as you and it helps to have an alternate point of view.
Now I learn at home using textbooks, solving exercises, programming and using online materials. I'm much happier now because I can spend as much time as I want until I feel I understand it.
My answer: don't take much notes. Write down only the main topics and unusual conclusions. There's not enough time at classroom so I need to learn at home anyway. If I were to go to university again, I would write down only a rough roadmap. Keep the best textbooks, exercise books and learning materials. They are like systematic notes, but better. For math it's good to have a topic covered by more than 1 textbook, because rarely an author has the same thinking pattern as you and it helps to have an alternate point of view.