Time to consider how to tell your school about your plans, and to ask about graduation next year when you return from USA. Better to do this now, and be prepared for university.
Sample...after you have shown your teacher you are a serious student.
Dear Teacher, I have American friends that want to help me by bringing me to the US for M-12 which starts there in the middle of August and finishes end of May next year, They have known me since I had my accident when I was 12. They were ready to take me into their home 3 1/2 years ago but I asked Ajan Ekkalak and Ajan Pui first. My friends have been coming every year for more than 10 years and stay here about six months-this is the first time they are taking a break.
Private schools can issue invitations through the US government but the school in their town authority expired so they are working to renew it. We are not sure of the travel dates because of that.
I want you and the school to know about this fantastic opportunity. I have met two of the EF Exchange students and four work/travel students that lived with my friends and they all say what a great learning experience this can be with my friends Larry and On Seale. They have spent lots of time working in schools here helping out with ESL.
I want to work with Mukdahan School on what I will need to graduate since I will be gone, and what I can do to take college entrance tests. I really would appreciate your help.
You may eventually need some adult help too. Let us know how we can help. God bless