Besides doing practice listening tasks/past listening exams or generally just immersing yourself in French, it's really useful to work on your vocab.
Do you know what topic the aural exam will be on (e.g. family or school)? It'll defs be something you've been learning so just go through key words and phrases and idioms so that you can pick them up easily when listening to the text without having to think too much about what you just heard.
Practise answering listening questions. Use the marks as a guide to how long your answer is but generally, the more detail you put down; the better. Pay attention to the directive. You will lose marks if you don't. Compare and justify usually come up a lot as the big 5-6 markers.
Good luck
