How to study for Japanese A Level

If someone has studied for Japanese A Level, please give me some tips on how to do it as I'm doing it for my 4th A Level.

I have lots of experience talking and reading Japanese, but not for writing.

もし、Aレベル日本語の受験受けたなら、勉強の方法教えてください。
日本語を喋ると読む経験あるだが、文章一度も書いたことないです