i dont think any a level is hard tbh
like if u have a good strategy to revisse n everything u should be fine
depends on what u like
u like essay based n a lot of content go for psych n eng lit n them kinda subjects...i hated psych too much content n too much stuff to revise
i did bio n chem n found chem easier simply bcz its more mathsy n i like maths so i did decent n got an A in terms of bio there was a lot more content n had to revise more than i did for chem but still got an A so its jus like know ur strength n weaknessess play the game n u will get there
good luck