The certificate in advanced English testbuilder is more than a book of practice tests; it offers students "tests that teach". This teaching function is achieved in part through sections of further practice and guidance. These sections review the questions in the practice tests, helping students to reconsider their answers and increasing their chance of getting the answers correct. The tests are designed to reflect the actual CAE examination as closely as possible. The edition with the answer key helps to further the learning process. Answers are often accompanied by an explanation of why they are correct, and why others are wrong.