How to revise set works for GCSE Music AQA?

I've tried listening through the piece and making notes about melody etc. for the whole piece. Just recently looked at an exam paper and realised I have no idea how to answer more advanced questions such as "how does Mozart create a sense of "balance"? What do you recommend doing for the set pieces of music?

Set Pieces:
Mozart Clarinet Concerto in A major (Movement 3).
From Little Shop of Horrors:
Little Shop of Horrors
Mushnik and Son
Feed Me

I’m the same as you!! Doing the same pieces- I just wrote down as many features of the sections of the music as possible and know it well and am hoping for the best tbh!! It’s annoying as it is new pieces being examined so there aren’t very many notes on them online!!

Good luck!