How prepared are you when you go to exams?

Would you say you know every facet of the paper inside and out? or you go with the attitude ‘I cant know it all’

I am sitting P6 Friday, its a retake but i feel that I can write something on every subject in the paper. Not in detail by any means in all cases, but i can put something down

I never feel confident going to exams though, I always worry the paper is going to select every subject i know the least on, and make a complete paper out of it