Which is the toughest B.Tech branch?

No branch is tough.

It depends on you and your interest.
If you are not interested in any of the branch, it will seems tough to you.And you can’t study it easily.

You can understand any branch easily if you correlate it with you interest.

For example - If you are interested in -

• How computer software works.
  How Websites are made.
  How do robots perform logical tasks like human after programming.
  How are games like PUBG,GTAs,and more are made.
  How can we open a door just by our smart phone app.
  How do hackers hack information.
  And many more…
  
  1- Computer Science and engineering/ Information Technology will be best option for you.

• How we really talk on mobile phone through waves.
   How are computers made i.e hardware.
   How does T.V, smart phone, refrigerator, washing machine, camera, microphone,   speakers and many more are made.
   How are logical circuits made.
   All things works on Electricity and Magnetism.
  
   2- Electronics and Communication/ Electrical Engineering will be best option for you.

• How does car, bike, airplanes, trains, works using petrol/diesel.
   How our air conditioner(AC) cools our room.
   How engines are build.
   How mechanical parts are built in robots.
   How are power-producing machines built.
   And many more…
  
  3- Mechanical Engineering will be best option for you.

• How are roads,bridges,railways,airports are designed.
   How homes, swimming -pools, stadiums etc. are built.
   How schools, colleges, universities etc. are built.
   And many more related to construction work.
  
   4- Civil Engineering will be best option for you.

There are also many others fields which i had not mention here.

So,Feel free to ask any dout.