Make notes as you go along. This is so useful because by making revision resources on a certain topic after each lesson, will definitely be helpful in year 11. Ensure you review them after a week or so aswell.
Print out your spec. This is specifically for subjects like science. It’s vital to know what you need to know. The spec can also be used as a checklist because even in cgp textbooks, they always have some waffle in it that you don’t need to learn at all.
Once you’ve learnt all the content on a certain topic and have reviewed it all from your revision resources and are confident. Then I suggest you to do practice papers specifically on that topic. They can be found everywhere (I suggest physics and maths tutor for sciences). That way, you can identify which parts of the topic you need to review.
Once alllll the content has been reviewed, do every past paper out there. However, only do this in year 11 when you’re near exams.
And finally just relax. GCSE’s are a breeze and with the right revision, all 9’s is kinda achievable but ensure you don’t get burnt out and pressure yourself to get all 9’s.
Hope I helped ☺️