While writing this book, we have constantly kept in mind the latest examination requirements of students studying in Class XII and preparing for competitive exams. In short, it is hoped that the book will embrace the requirements of all the students and will earn appreciation of all the fellow teachers.
Although every care has been taken to check the mistakes and misprints, yet it is difficult to claim perfection. Any errors, omissions and suggestions for the improvement of this content, brought to our notice, will be thankfully acknowledged and Incorporated in future.