Welcome to bb and thank you for sharing your story. I am really sorry that you find yourself in such a difficult situation, especially during such an important academic year.
I think it's fair to say that most parents and teenage daughters experience conflict at one stage or another (this was a common occurrence when my daughter wss 17). It is possible that the directive to leave has been made in anger and will not be followed through.
However, even if this is the case, I think it might help to ask another adult family member to mediate a discussion with your parents. Perhaps a grandparent, aunt or uncle or close family friend could help.
If the worst case eventuates and you are made to leave, I suggest you speak with your school counsellor, GP or the parent(s) of a close friend. This is because I belive you are going to need caring adult support to find your way through this.
I am happy to continue talking. Do you want to share a bit more about what happened or how you are feeling? No pressure to respond but I am here for you.
Kind thoughts to you