H E L P

I have some important questions. I am planning to change sixth form after i have completed my AS level exams for photography, psychology and sociology. In the sixth i am planning to go to, i want to carry on with photography and psychology with the A2 part, will that be possible? Secondly, i want to drop sociology so i could start doing a drama course there ( my current sixth form did not offer drama and i was upset over this ). Do you think i will be allowed to begin the AS drama? Thirdly, will they allow me to stay a year longer so i can complete the drama A Level? Or will they not let me? Thanks.