World Class is a new, two-level series from National Geographic Learning for high-intermediate and advanced English language learners. This integrated-skills program uses National Geographic content, images, and video to help learners expand their overall fluency while developing the tools and strategies necessary for effective, real-world communication.
This book is for advanced learners. I think it is great as a reference tool, especially the teacher's edition, but not as the only source of activities and exercises for the class.