Immigrated to the United States, now in senior three, and want to study abroad. What proof do I need to go to school to type?

If you want to apply for a better school in the United States, I suggest you take the college entrance examination before you go, because many schools in the United States will take the college entrance examination results as an important reference! This is more likely to apply for a school. The certificates you need to open at school include: proof of studying and transcripts of previous years. I wish you a successful application!