Engineering

If you're fulfilling up the age criteria, of course you can.

Kindly visit this link:
https://www.shiksha.com/science/course/b-sc-in-physics-and-computer-science-sastra-university-thanjavur-284536

There are good chances of getting the college, check the following link to see more details:
https://www.shiksha.com/science/course/b-sc-in-physics-and-computer-science-sastra-university-thanjavur-284536

Following is the link with the list of colleges you can refer to and choose the best one:
https://www.shiksha.com/engineering/colleges/diploma-mechanical-engineering-colleges-Kolkata?ts=83515995&rf=filters&ct [

Yes, you are eligible. You need to score a minimum 50% in HSC for BCA and for MCA, you should opt for maths in BCA.
All the best.

You can do BCA where you'll learn some coding languages but you can't do B.Tech in CS.

Just decide on the basis of your interest. Then do search on the available options on the chosen subject as a career field. But yes since you've got 80 in maths I guess you have a descent control over maths and you should go for maths, it has a good scope.

Dear Sarath,
Jaipur national University has Civil Engineering Department in M.Tech. Kindly follow the link below to know more about it:
https://www.jnujaipur.ac.in/program/22/22/6/2/program/22/22/0/2/postgraduate.

Hello,
You have good chance of getting admission into old IIMs.

If you are from commerce background, you have a huge opportunity the following are list of course, you can opt for
law with Honours:
B.Com
BBA
c. A
icwa
CS
cma
B.Sc computer Science, computer technology, software system
B.Sc psychology
B.A English literature
Integrated BBA-MBA form IIM, Indore or other uni