Chadaporn, Thanks for your message! Yes, I understand it's a busy time with you and your host family. We would love to have you as a student in the Fall or Spring, whichever is best.
Admissions would need your high school information from your home country, and any other assessment (test) information that you have taken (English or other tests), but starting an application will help that process go more quickly. Let me know if I can help as you get started.