This book has been one of the best book I have ever read this book has helped to crack ssc railway exais is is very nice I dont think this book should need any upgradation because it has already anough information in this book so first of all I want to give a short review of this book this book has all the summary based question this book has many extra detailed and depth answers and solutins to it the history part of this book is very interesting I prefer this book book to all the students who are preparing for any of the competitive exam this book is awesome