I maybe wrong but this is my personal opinion that CAT is toughest exam in India. In school you are just taught basics and exams are based only on basics and not applications. Even if you are good at basics and join classes and appear for mock tests CAT is still difficult. It is pure myth that CAT is not that difficult. I have appeared for CAT and yes I was good at Maths and English but still found it difficult because the exam is all about your thinking ability and how you arrive at solution in quick time. Hence hats off to this boy who have scored 100 percentile at CAT and who is also an IITian. There is no doubt that he worked hard but he also has exceptional intelligence.