To be fair, it depends on the individual!
From my experience:
Sciences - Making personal notes/rewriting a whole textbook summarised with key points required to learn (not just random info). That way, essential information sticks to your brain as you mind-map each unique idea through font and style on paper. If you want to make things stand out in your notes to remember some key points, try drawing diagrams to add to your notes. That way, you are able to recognise the section of info you've summarised - make it stand out!
English - Practice papers - Moreover, warm up with writing until you're comfortable with writing at a fast pace. (A fun thing I find which helps expand my vocabulary is by watching Netflix shows!)
Maths - Honestly, I don't think you can really 'revise' maths - so instead, make sure you understand all the concepts and correlations in the curriculum.
Remember, this is my way of studying to get 9s for each subject; Additionally, each person has their own style of revision - so I advise you try different revision strategies and find one which works best for you!
Good luck with the revision!