Mandarin A-level help

One of the subjects i am studying is A-level Mandarin and i am finding it really hard, I currently have a grade D in it.
I did Mandarin for scenes as well and got a grade 7 so i thought that i could handle it but i am currently struggling with it a lot.
I have to write essays on a book and a film, do speaking and reading and listening.
I struggle the most with the speaking, listening and the writing and i need some tips on how i could improve on them. For the listening and writing i struggle with writing the characters and grammar structures for writing. With speaking is similar but i cant really form sentences on the spot and i often cant remember important terminology or cant under stand what the teacher is saying fully.
I know its a lot of problems but i dont really see how i can solve it with just revision since i have revised plenty for a lot of these aspects and i just need some help and tips to allow me to get better.
Any help is greatly appreciated, thank you