chemistry igcseWatch this thread
I know Hegarty maths goes through hard maths questions and explains them very well, have you done a quick scan of YouTube searching up “chemistry hardest questions”? This will usually bring up some questions people have struggled with in the past, and how it’s best to solve them Don’t dismiss GCSE videos, they’ll be very helpful too as the techniques you’ll need are usually the same
I hope this answers your question!
I’ll tag in CheeseIsVeg to see if they can move this to study help for you