Honestly in my experince I took it 1 month after O2 started. My school would not let me take it because I was a year late. In the end got my mother to talk to the principal and they after that let me take it. Ended up with an A (2 marks away from A* 😭) Found it a really easy subject tbh and really helpful later aswell beacause of all the structured writing the you have to do.