Hey, I'm in year 12, and in the first couple of weeks we had some extra students join, and some leave. It would be worth phoning up the sixth form that you want to go to and see if they have any spaces left. If not, you could try sixth form colleges/ colleges as they are bigger so usually have more free space. I would do it soon as the further into term you get, the harder it is to catch up, so the less willing to take new applicants! Good luck.