For English advanced, I started the common module and module B by typing out like three or four short dot points about the context of the texts which I would broadly address in my introduction to both of these essays. With module A, I did a small comparison table between the contexts of my two texts (Richard III and LFR) which pretty much gave me a direct comparison/contrast that formed the basis of my intro and individual ideas in each paragraph. For Mod C, I found like 4 quotes (2 from each text) that covered as many techniques/ideas as possible (E.g. tone, metaphor, third-person etc.) that, if needed, I could draw reference to when creating my mod C piece. In regards to the notes for my common module, mod B and mod C sections, I grouped my quotes under three main broad themes of the text. Under each quote, I would then put a line or two of analysis and highlight/underline the techniques used which helped me to remember them. As mod A is focused heavily on context, I also put a line relating to the quotes reflection/impact on context, and how it is meaningful in that regard. In relation to the creative/discursive/persuasive aspect of mod C, I wrote some practice creatives throughout the year, and borrowed ideas from those that both my teacher and I thought were strong and simple enough to write well under exam conditions.
This may seem like a lot, but once you get your themes and list out your quotes, you're pretty much 80% there! I know it's cliche, but the key to doing well in English advanced is PRACTISE and ANSWERING THE QUESTION! Once you feel comfortable with everything, go on THSC and do some of the practise papers there. Especially for the comprehension and mod C, the papers give you a rough idea of what can be asked, as well as the different ways these questions can be asked. (I.e. through pictures as stimulus, different wording etc.)
I didn't memorise any essays as, personally, I felt that I would get too caught up in memorising my essay and completely neglect to answer the question. It depends completely on what you guys prefer, but I personally wouldn't recommend it as I feel that it'd throw you off if you forget something important.
This may seem like a lot, but it's not too overwhelming once you break it down. Work hard and be confident in what you guys do!
Good Luck!