Yes the book covers whole of the syllabus,if you are preparing for the CSS exam but if intending to appear for PMS ,then as you will already know,that there are two papers of Punjabi,Part 1 and Part 2,so you have two buy two books of the same publication er,i.e Jahangir. But you can go to other options too like consulting any another good available book.The thing why i suggested you this book is that it is also recommended by good number of forum members who are CSS qualified.