Learners test their English, check their answers, then test themselves again. Feedback on every answer means students really learn from their mistakes. A test, answers with helpful tips, and a second test on the same topic in each four-page unit, twenty topics in each book, twenty 'Review' pages, leaving a mini reference book once all the tests have been completed, written for self-study and also suitable for use in the classroom. Level: Upper-Intermediate.