What are the procedures for sophomores to immigrate to the United States in China and choose a school?

You need to notarize the transcripts of the courses you have studied in domestic universities, and American universities will give you a brief description of the contents of each course (in English). According to the requirements of your university and major, see which courses meet the requirements of your chosen major in the United States, and the credits of these courses can be transferred to American universities. You don't have to take these courses anymore.

Some schools don't require TOEFL, but generally you will be required to take more ESL courses.

Your immigration status allows you to apply for scholarships or grants in the United States.