I want to immigrate to America, so I want to transfer to high school. What can I do to improve my oral English by putting up posters in the newspaper?

After confirming the situation of immigrants, you can choose a public high school that is close to your address and convenient. Most children in American families go to public high school because it is free. Of course, you can also choose a private high school. Now you can get a SLEP score in China, but there will be a language test when you arrive at school. In Shanghai, you can take classes at the ELS Center, which is a typical American education model. Cooperation with many American universities will make you feel the real American classroom, make your language level go up a big step in 2-3 months, and prepare you for studying in the United States.