I got a grade 9 last year in English Lit (AQA spec). Because none of my teachers knew what grade anyone would be likely to get due to lack of information, we kinda had to improvise.
I don't know if you have open or closed book texts (all mine were closed) but remember enough quotes for each theme/ character which is likely to come up. Although you don't know exactly what question you will get for each text, you can pretty much guarantee that the questions that came up last year probably won't this year. Come up with some original/ non traditional interpretations and make sure to back it up with textual evidence. Also, if possible make sure to write about alternate interpretations.
Make sure to include the writer's name a few times at least for each text you write about (examiners like this).
Additionally, use some 'fancy' connectives to replace the generic 'and' and 'but', just to make your essays seem more professional.
Last point: try to make the structure of your essays as clear as possible so your examiner knows what is what, ie. Intro and conclusion. Always introduce your point at the beginning of each main body paragraph; at the end of each para also make sure to relate your point back to the question to let the examiner know that you are actually answering the question.
Sorry that I've written a full blown essay, I hope this helps you. Don't panic and try to clearly structure your ideas in your head beforehand (easier said than done) and knowing your texts will definitely benefit you. Good luck on getting that grade 9!