Science

B.Tech CSE is a higher and superior educational qualifications. It is the de facto most accepted qualification for job as a developer in IT industry. B.Tech CSE graduates are the first in any engineering college to get placed in campus placement. B.Sc graduates only get low end application support roles in starting of career and grow as developer with experience.

You can opt to go for environmental studies that will give you multiple options to pursue your passion.

Check the links:
https://www.shiksha.com/science/course/bsc-bed-regional-institute-of-education-bhopal-32696
https://www.shiksha.com/humanities-social-sciences/course/b-a-b-ed-regional-institute-of-education-bhopal-163836

Yes, you can get into a better architecture college. Better way that you try to get in a private college at Bangalore.

Dear Srinivasulu Reddy,
Yes, HVAC is a better option than piping design field. It's because there is more demand of HVAC engineer in today's time than that of piping design.

In JEE Mains, you need not to score any specific marks in respective subjects. For general category, you need aggregate of 150+ to get in any of the NITs.