If you would like to study as a full-time student in the United States, you will generally need a student visa. There are two nonimmigrant visa categories for persons wishing to study in the United States. These visas are commonly known as the F and M visas.
You may enter in the F-1 or M-1 visa category provided you meet the following criteria:
You must be enrolled in an "academic" educational program, a language-training program, or a vocational program
Your school must be approved by the Student and Exchange Visitors Program, Immigration & Customs Enforcement
You must be enrolled as a full-time student at the institution
You must be proficient in English or be enrolled in courses leading to English proficiency
You must have sufficient funds available for self-support during the entire proposed course of study
You must maintain a residence abroad which you have no intention of giving up.