In most of the competitive exams the syllabus will be too huge and Quantitative aptitude will be a part of it, the book covers almost all concepts related to quantitative aptitude in detail, but the book is quite bulky, it would be still good it stands in between Shakuntala devi puzzles and this quantitative aptitude book, there are too many questions of similar kind, which is a almost a repetition, it would be better, if we have 10-12 problems in each chapter which would cover all the concepts of the chapter, which will help the students to revise the book again and again, here since the book is huge, it will be very difficult to complete it and revision is again a problem, but the book is very good for practice purpose There are also short tricks for students which will help them in solve question in lesser time which is a good thing for exam point of view. Because now a days exams are easy but the time allotted to attempt each and every question is very less. These short tricks really going to help those aspirants who complaining availability of time after the examination There is a difference between "just preparing" for an exam, and "preparing to achieve the topmost score" in an exam.
In case you want to just prepare, this book is okay. It will give you sufficient questions.
But if you really want to crack all written tests well and make it to the top, then ARUN SHARMA is the author you should refer to.
He gives amazingly explained concepts and very good questions, which will surely help you in clearing any written test you sit for. I will not recommend this book for CAT. Other wise refer this book for Railway exam, SSC exam, Bank exam