Creative writing tips?

How many pages do ou write for full marks? Etc.

I finished Section A of English lan AQA, and I’m not as proud of it as my last mocks, I want to make up for it with my Section B.

I need it to be perfect 😭

I’m thinking of story of a woman in car accident, who goes in a coma and imagines a life with children and kids, and then her reality breaks down and is sucked in by a mirror, and she wakes up in hospital and goes mad.

And I think I can manipulate that narrative to fit any prompt..???