what is the hardness level among the following three branches at iit CSE,ME AND EE?
Hope you are doing well. Among the three mentioned branches, EE and CSE are considered as hardest when compared to ME. CSE is fully dependent on programming, where you need to learn different programming languages and have logical thinking and you should be even good at mathematics. EE depends on electrical components and switches and even some circuit designs and also some amount of programming. Mechanical Engineering depends on the mechanical parts of the machines, engine design and so on. I hope you got the point after reading this answer.
All the best.