- Make sure you understand everything you learn during lessons before you leave the classroom. Even if this means pestering your teacher with questions. I found that this helped me a lot when it came to revision because I'd already have a pretty strong foundation of each topic and mainly needed to remember little details.
-Plan your revision a few months before exams starts, ideally write your notes during lessons or later on that day. This gives you more time coming up to the exam period.
-Past papers. They are, what I would say, the most important part of revision. Try to do each of them more than once and see how much you improve. If you run out of papers for the current specification, search for old spec/legacy papers, even try papers from other exam boards which are similar. The more practice you get, the more familiar you'll become with the papers. Don't become too complacent though, you never know what will happen in the exam, always be on your toes.
-Whilst doing past papers, you should also be paying close attention to how marks are given in the mark schemes. As much as it's vital to know the content, it may not help you enough if your answer doesn't match the mark scheme because they require you to be a lot more specific than GCSEs.
-Read some of the spec and examiner reports. They can only test you on what is written in the spec and examiner reports provides info on the common mistakes made for each paper, best to try and avoid them yourself.
-If your subject has a coursework unit, look at the reports for these too. It might be worth looking at examples of your subject's coursework too if you're stuck! Ofc you know not to plagiarise
In some cases, these things are easier said than done. But you must remember that if you do these efficiently and to a high enough standard, it'll be worth it in the end
Aim high and always do your best!