This is very good book to prepare physics to crack iit jee.it has wider concept of physics.it is very simple to read.it has designed like this that anybody can read. this book has wider range of question to solve.it don’t have unnecessary formulas.it teaches us that you can derive all the formula from a universal formula.it’s main focus is in to explain basic concept of physics.kota teachers are also refers it to study.when I was in kota the physics teacher had referred me to read.it teaches step by step first definition from where it has came and then mathematical prove and then question based on it.in the question it has scientific approach first it takes simple question and then its increases the level of question.it promotes to students for deep study.the book is written by harish chandra verma.this book has two parts first "concept of physics first"and the second one is "concept of physics second". you can purchase this book from market or you can order it online.it will cost you around six hundred rupees to purchase both of books.