Most High School students have usually had several years experience with native ESL Teachers/Tutors so they have a good grasp of the basics. It is time to dive into more conversation expansion with deeper comprehension to prepare for High school exams and, for some, to prepare for IELTS tests for students planning to go abroad. High School English courses require a lot more work to tailor the course to the groups levels, but , the result is well worth it.
"An outstanding book for both iBT and IELTS preparation. All skills are covered in every module, but the way they are drawn on is so natural and seamless in the thematic treatment that you barely notice any major transition from one skill area to another.
Excellent book, and from what I hear from colleagues, an excellent series overall. If you're preparing secondary school students or adults for iBT, IELTS or just across the board English skills, I heartily recommend trying out this series in your classroom."
http://jasonrenshaw.typepad.com/ibt_speaking_writing/ibt_book_reviews/