What would be likely to happen to me in court?

This is tricky because you are a juvenile, but drugs and schools just don't sit well with law enforcement. I would definitely talk to your Public Defender before entering your plea of guilty. He/she can talk to the prosecutor and maybe plea the charges down or consolidate them into something of a lesser charge. I am also not sure as to what you will be convicted of, because once again, you are a juvenile and the laws do vary from state to state. It would also depend on the Judge. The Judge I worked for was pretty lenient on people - but not all are like that. Good luck to you.