i was always lookign at the syllabus and making sure i remembered stuff about every dot point in there. also doing past papers consistently helps with remember things across multiple modules. even if you've only learnt say mod 5 and mod 6 and you know your next assessment is on mod 7, whenever you're studying in the downtime between assessments, do questions from mod 5 and mod 6, and then closer to assessment time narrow in on mod 7 stuff. that makes sure stuff is mostly fresh in your brain and helps from completly forgetting a topic, then come hsc/trials you don't have to cram all of your study time into those 1-3 or 1-2 modules that you haven't been consistently studying. constantly flicking back through notes can also help, it is a more "passive" way to remember things but if you look over your notes once a day for 30 minutes for 3 months it does soak in eventually, and helps you at least keep familiar with concepts/information that you need to know.