As someone who loves French, and managed to get the top score in my school for the overall Higher exam last year, I would say that the top things that helped me for the speaking part of the exam (I got 30/30) is to get your teacher to record your speaking on a phone or something that can record things. This helps with the pronunciation and the memorization as you will hear it repeatedly (an example of this is knowing every lyric of your favourite song or every line from your favourite movie.) Listening to French songs or watching French movies can also help with pronunciation. Try physically writing your speaking as well as this could help you with the memorization as well.
You could also try to translate the entire thing into English and write a paragraph on a flash card or index card( whatever you may call them) as I found this to be helpful when I had forgotten what was supposed to be said next.
I'm not sure how to AQA does their speaking exams but the SQA let us bring a piece of paper with 40 words on it (either in English or French) to help us, and I had one question that I could never remember but, luckily, it was exactly 40 words so I just copied it out word for word in French. If you don't want to do that you could also consider making short notes on each paragraph/ question so that when you go in you have a few prompts should you need them!
Hope this helps and bonne courage pour la examen!