Dd is doing her GCSEs this summer. She's quite good at maths. In a recent maths test/ mock at school, she dropped 1 mark out of 160 (or something like this) and that was only because she made a silly mistake. Her teacher has now challenged her to get 100% in her real exam. Got me wondering how we would ever find out if she achieved this or not. I'd assumed she'd just get the level and Dd seems to think you don't need to get anything like full marks to get a 9.