In retrospect, I have some revision advice:
1. Try to get ahead if you have time: you will want some time at the end of year 11 when you feel that you know everything already
2. Although online flashcards on quizlet can be useful, especially for French, don't let them be your only method of revision (make physical flashcards for some subjects too) because eventually school will let you start revising in some lessons, and they usually won't let you use online flashcards for that.
3. Surprisingly few students know this: on your French syllabus, there is literally a list of every single word you need to know for the listening/reading exams. Learn these words, and you're sure to do fine. Occasionally, teachers give you lists of words that are not on this syllabus. Don't spend so much time on them.
4. Learn the markscheme for English lit and lang. The markscheme doesn't really change between years, so it'll be very helpful.