These books are truly Useful if you are prepaid the CPE on your own, as you get familiar with the method used qui Will Be During the exam. I highly recommend the 3 of em. - The book 'Common Mistakes at Proficiency' is Organised into sections (or Units) dealing with topics specif. There are exercises to practice Each unit and finally for Assessment Tests to the over-whole understanding. Answer keys are available to enable qui highlight your pain-points. - Likewise, 'Objective Proficiency Workbook' has-been of help Tremendous. - 'Grammar for CAE and Proficiency', is very full. It includes exercises for aussi Each unit, and tests for assessment purpose.