I would buy my daughter Model Essays, it's not very common to hv Taiwan/ Cantonese version, but you could still find some locally. If you go for Mainland China versions, they hv plenty.
Liked the practice for HKCEE/ A level,
we could read/ study 1 or 2 essays everyday,
highlights good sentenses, memorize it.
The progress will be obvious.
Liked the "Chicken Essence" for our supplement.