Hey everyone, thought I'd chip in some advice having done English this year.
My honest opinion is that if students have already developed a unique writing style and are confident in expressing themselves, that English shouldn't be a worry.
Having said this, a key component of English this year (last year of study design) which is being addressed and changed for next year is the removal of Context and the addition of a 'Comparison of Texts'. I would dare say that Context has been troublesome for many years, because if any, it was the most 'memorisable' part of English. I have seen many students get away with memorised pieces which are slighlty adjusted to fit different prompts, largely because Context allowed a little too much free space to write whatever you wanted (which was nice, yet exploitable). I'm not sure whether the new addition will completely solve this or not.
As with Language Analysis, although you can memorise writing formats and structures to approach the task in order to express yourself a little more fluidly/layered-ly, I don't see much tangible benefit to memorising pieces for this part.
I feel that Text Response is in the middle of these two extremes; you can memorise key evidence/scenes from texts and incorporate these into many essay topics, particularly because the exam will have 2 topic choices available and it is relatively straightforward to 'snipe' at least one of these topics before time. For instance, the Medea prompt that I wrote on in the exam was EXTREMELY similar to a SAC topic that I wrote on, and, due to the argument presented in my 3rd paragraph, meant that I could copy word for word and it would be fine.
TLDR; I think that if you work ahead and develop your writing 'personality' throughout the year, that you'll do just fine. Having said this, I admit that the system is exploitable, but I think that the removal of Context and the inherent nature of Language Analysis will make it more difficult to get away with memorised pieces. Text Response will still be vulnerable to memorisation though IMO.