Depending on the specific needs of the student(s) I suggest course-book(s) which allow them to reach their language goals. For general English classes I use course-books that offer a wide range of topics (as the Headway series above) and are well suited for developing all four main language skills. For TOEIC and EIKEN studies I use a lot of past test material so as to help the student(s) get familiar with the content and format of the exam. I also supplement this with other teaching material for the areas they need to particularly focus on.
Thoroughly tried and tested, New Headway retains the core content from the original series but improves upon it with streamlined units and up-to-date material with global appeal. A balanced syllabus with a strong emphasis on speaking, builds confidence and promotes fluency. A solid grammar syllabus, substantial reading practice, plus the best of recent language learning approaches.
New English File, the course that gets students talking. The perfect balance of grammar, vocabulary, pronunciation, and skills to help students use English really effectively.