"Adroit (C- Unit)" Preface of This Book: This brand new edition has been completely revised to reflect all the changes in the new curriculum of NCTB and DU C unit' question pattern. We would like to present the book as your personal English tutor. Like any good tutor, it will work closely with you, prompting you and giving you pointers to improve your test skills . The most distinguished feature of this edition is that all the practice questions have been properly explained. For a long time, students were demanding a book, which contains plenty of exercises with explanations. We are very happy to provide the students with such a book.