Language achievement
TOEFL or IELTS scores (some schools explicitly require TOEFL or IELTS and need to check in official website) and SAT scores (if you want to apply for scholarships, you must take the SAT).
School performance
Three years of high school grades (at present, some American universities recognize the results of college entrance examination).
Personal experience
Social practice, volunteer activities, award certificates and other materials.
Letter of recommendation and application form
Letter of recommendation, application form provided by the university.
Personal statement and study plan
Personal statement and study plan.
Financial proof
Financial proof.