Kanpur

You can do MBA, M.Com, etc. for your interest in accounts. Do preparation for government jobs by side.
All the best.

College change or university change after the first year is completely dependent on college and university norms, some university allow it and some won't plus you need to have good scores in the first year to apply for the same.
For further details, contact the college authorities.

You can try for a paid seat.

Hello, hope you are doing well.
Yes, you are eligible to get admission in HBTU, Kanpur with 848 SC rank in JEE. The last year cut-off was about 160 marks in JEE Mains. You can get the admission in B.Tech in your favourite branch.
Congratulations and all the best.

Please mention what is your GN rank because counselling is done by GN rank.

Check out this link:
https://www.shiksha.com/b-tech/resources/upsee-college-predictor