How do I ensure that I get the top grades in English Literature A-Level, given the relatively subjective marking?

I found that there are a couple of things that helped. Every paragraph that you write must contain at least two quotes from the text. First, you must analyse these quotes linguistically and thematically. In addition to this, every paragraph must include a critical reading. It would be even better if you can find another reading or two that disagrees with the first critic, if executed correctly, you will show that you are delving further into the academic discussion. Whilst doing so, you must actively engage with the critics, that is, you must explain articulately why you agree or disagree with the critic. One must also explore the contextual relevance of the text. However, it might be a little excessive to do it for every single paragraph. So, I used to dedicate a paragraph entirely for the context and refer to it from time to time in the other sections of the essay.