I used the loose leaf ruled paper (still do).
Was good because I could have all my notes at the start of the topic then answers to the questions at the end, and have it all in order and stuff. If we ever went back over it, just chucked it in the folder in the correct place!
Notes were always really neat (but I write quite small) to make it easier to go over it, but my exercises were horribly messy haha.