what i might get in old iit, i got 6247 rank in iit 2018.

my prefences are either bs or btech but safe branch and what about changing branch. also about iist or iiser

Indian Institute of Technology (ISM) Dhanbad Electrical Engineering (4 Years, Bachelor of Technology)
Indian Institute of Technology Kanpur Chemistry (4 Years, Bachelor of Science
Indian Institute of Technology Kanpur Earth Sciences (4 Years, Bachelor of Science)
Indian Institute of Technology Ropar Civil Engineering (4 Years, Bachelor of Technology)
Indian Institute of Technology (ISM) Dhanbad Petroleum Engineering (4 Years, Bachelor of Technology)
yes branch upgradtion is there so choose a good college and then after if you score good in 1^styear you can change branch