With SOR, the syllabus is quite narrow. So for the religious depth studies, I would keep my notes short and simple, but long enough to put together an essay on each point (i.e. significant person, ritual and ethics). With the first topic (Religion in post 1945 Australia), I would probably do some notes on it and then practice some past papers. This is what I did/would do - but as I say, study is about finding what works for you.