There are a lot of approaches to different problems. When giving JEE, students have mastered problem solving. But JEE needs quick problem solving and the best approach that makes you reach the answer the fastest. So it is not just about speed, it is about velocity. If you are moving in the wrong direction, you are moving further away from the answer. This book helps you find the direction to reach the answer the fastest. I wish I had such guidance in chemistry and maths too.