Today morning my teacher told me i have to do an extra gcse because i wont achieve my minimum of 8 which isnt true as i have written 9 subjects since year 10. I told her i dont want to do it because i have a physics exam on friday and i would be leaving on that day and she said i can do it next week. i really dont want to stay another few days to do this subject which is a btec anyways so i told her my mum will write a letter. Can she force me to do it?