How to pursue engineering from IIT? What is the preparation required?

Hello Chandramani, It's good to hear that you have such a high ambition in your career. As you have set your ambition so high, so you should also be aware that you need to work really hard. You should understand the basics of physics, chemistry, mathematics and computers that you will be learning i

You should join a coaching institute as they have a planned curriculum with regular tests to evaluate the students. You can start practicing the various concepts you learn in physics, chemistry, maths and try problems in different applications of those concepts from reference books.