how to do memorise and actually rmeember all the content
look cover write check (essentially) + practise questions
syllabus and other rote memorisation stuff i just wrote it out over and over again by memory on a whiteboard (used funky colours so i didn't get too suicidal) until i knew it off by heart
practise questions are better for memorising content you actually need to think a bit about as well as linking bits of content together. personally i started answering individual q's w/ open book then progressed to timed/exam conditions. i think the process of using your brain to apply knowledge that fits the question helps internalise stuff better imo
(also pls be aware i did not study enough throughout the actual school year and basically just crammed everything 1 week before trials and same for hsc. so probably not a great way to study if you actually care about the subject, i hated it and was just there for the accelerated opportunity and marks.)