I didn’t do French I did Spanish GCSE but here’s what I would recommend for languages:
. Quizlet flashcards to make sure you can learn and recall vocabulary
. Past papers
. Annotating your practice papers. For example, highlight where you used key vocabulary and connectives. If you haven’t highlighted much of those, then try use more. Set yourself new goals with each writing piece you do, and where you have used impressive idioms/vocab write those down and keep on flashcards