For example, if I wanted to study for History GCSE, could I just enter myself without doing an official course? How does the coursework/controlled assessment work?
Also, when I was doing O-Levels/CSEs it was common for parents who thought their DC had been entered for the wrong one to pay for them to sit the other one too. For example DH was entered for CSE maths by the school, but his parents thought he could pass O-level and paid for him to enter that too. He then sat the paper(s) at school, with the pupils the school had entered for O-level IYSWIM.
It looks like DS1 will be entered for the foundation paper in a couple of subjects where he would have like the opportunity to try for higher than a C. Is it possible for us to pay so he can enter the higher paper too?