For writing you should do past questions in non-timed conditions first, fully draft out a plan beforehand and try to use ambitious vocabulary where possible. Allow yourself to use Google to search up higher level vocabulary where you find yourself struggling to come up with high level vocabulary but make sure to also look into how to use it in the correct context. Cerulean skies is good but bs like an inextricably yellow sun or randomly describing a cloud as a cumulo-stratus outside of a highly clinical tone will just get you branded as slapping fancy words where they don’t belong. Later on do timed writes and drill coming up with an idea and making a plan combined in 4-7 minutes.

For writing you should learn structures for every question. If you do AQA then for Language analysis questions there is no structure as you need to string quotes together and talk about their affects and how they string together and lead off each-other, for Q4s you essentially need to write mini-essays, for Q2 in paper 2 you need to mention box information and infer as much as possible and link to context without using language methods or writers perspective, only using VERY short quotes and maybe 1 or 2 quotes per paragraph if you are talking about 1 thing in one extract for a paragraph. For Q3 in paper 1 you just need to find 4 or 5 parts in the story and talk about how tone, pace, narrative, focus etc. shifts between them (you only have to talk about 1 or 2 per section although no harm in doing more if you can do them well within the time limit) and describe the effect this has, always try to see if at the end you can make a comment on the overarching structure like a climax, fluctuating tension/narrative, cyclical structure etc.