I understand this must be frustrating for you, but at least your school obviously care about you and your welfare.
My school refused to take me back after my psych admission and refused to let me sit my GCSE’s and the college I wanted to go to (after I finally sat my GCSE’s a year later) refused to let me into mainstream classes or even onto the premises. I ended up leaving halfway through year 12 because they hadn’t even enrolled me and were teaching me gcse content not A Level content and had no interest in me ever going to the college.
What I’m trying to say, is it may be annoying but they care about you. I never got that, I had all the doors slammed in my face. I suggest that you speak to your parents and have a meeting with your head of year/ mentor about how you are feeling, and see whether they can give you a bit more sense of freedom and independence.