I did aqa French last year, I know it's not the same board but I feel like these are general, helpful tips! Basically, do every single past paper and do them all again! I think I completed every past paper at least twice, I also made flashcards. For words I could never remember I would stick them around my room -lame but helpful- and go over them every time I walked past! I also did vocab tests in class which I would take home and get my mum or dad to test me on. Since GCSE has a big focus on vocabulary just try and learn as many words as you possibly can. To help with listening I used to listen to the French news on YouTube every morning whilst getting ready for school as it's spoken really fast it helps if you can learn to pick information/ words from it. As the listening in the actual exam is spoken much slower! And that's about it really🙂 Bonne chance😉