I used this book at time of jee preparation according to I mainly perfere cengage on physics and mathematics, organic chemistry because quaality problem in this so good so you can revise and clear each and every concept . another silent features about book is no of problem and type of problems in this book that is asked for jee advanced .another silent features that is amazing is prolem on each and every topic have specific problem that helps students to understand concept .you must buy book if you are average and hard working. student. follow me if you like reviews