The visa you will be traveling with is determined by the intensity of your English immersion. If your main intention is sightseeing, going shopping, or visiting family, then it is suggested to apply for a tourist visa (B1/B2). If you wish to pursue an academic route, a student visa (F1) is required. However, student visas are only granted to those who plan to study more than 18 hours per week. Courses and stays that are under 18 hours per week are considered by the US Government to be solely for leisure, therefore the only possible visa that is attainable is a tourist visa.