Hi Naveen. As you have scored 82% in the +2 . It's a good score and it's a right decision opting for btech and if you are interested in coding and updating your self in new technologies I suggest you to take CSE and if you are interested in wireless communication, embedded systems ,VLSI  I suggest you to opt ECE and if you are interested in mechanics and have a passion in physics I suggest you to opt mechanics and if you are interested in construction and design I suggest civil engineering . And there are other branches which are available in many of the institutions like information technology, electronics and computer engineering.