New Oriental is famous for English. I went, and the effect was not bad. If you want better results, then find five people with similar level in that group, but every hour 100. Of course, if you give more money, you can also let the teachers there tutor you personally. (Speaking of which, today's tutors are quite dark. Before looking for a tutor, you'd better search for a few reputable ones on the Internet, or you'll be hurt if you accidentally find a newly graduated college student.