New Oriental, their TOEFL course is quite famous, and the teachers are relatively strong. TOEFL classes include basic classes and intensive classes. If you are a freshman, you should start with basic courses. Basic classes will talk about some basic contents, and their intensive classes just need to teach some exam-taking skills, as well as some difficulties and test sites you will encounter in the exam. The specific time and course arrangement can be seen on the website of New Oriental.