Sort of.
imo, hard work plays a 90% role in getting high grades, the other 10% is natural ability
I weren't great at English Language/Lit at GCSE despite me working so hard for it, I only managed to get an A. That's great but it's not the top grade is it?
Similarly, there is a chinese girl in my class. She is really intelligent in chemistry and maths (full ums in AS Maths) She didn't revise for mock exam for maths yet she achieved 96 ums for the mock exam. For chemistry, she didn't revise but she got the highest grade in the class with a high C.
unfortunately, natural ability does play a part, a bigger part in some