India

https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-delhi-ncr?uaf[]=et_dm&ts=8366411&rf=filters&ct[]=10223&bc[]=6&ed[]=et_21::dm_34
Please click the link above to get a list of good distance B.Com colleges in Delhi NCR. Choose the best college for you by comparing the colleges with:
https://www.shiksha.com/resources/college-comparison

You can get KJ Somaiya, Baba Ramdev Engineering College, MIT-Pune, ICT Mumbai University, etc. VIT-Pune and IIIT-Pune may be another good option. You can also check these colleges:
https://www.shiksha.com/b-tech/ranking/top-engineering-colleges-in-maharashtra

Yes, you can apply through CET and JEE main.

There are many good Institutions in the Delhi please follow the link:
https://googleweblight.com/i?u=http://www.shiksha.com/mba/colleges/distance-correspondence-mba-colleges-delhi-ncr&grqid=PycLsdVz&hl=en-IN
https://googleweblight.com/i?u=http://www.shiksha.com/mba/articles/top-10-institutes-for-distance-correspondence-mba-blogId-6301&grqid=5S0cHzOi&hl=en-IN

I would suggest you for UEM, Kolkata for mechanical engineering with good placement record. Visit here https://www.shiksha.com/university/university-of-engineering-and-management-kolkata-47398 to know more information about the college and its courses.

You can think of Chitkara University, HP for various B.Tech streams. It provides you best infrastructure, faculty, sports complex, course and placement which is the ultimate goal.

I am no one to decide the best university for you. But I can suggest one good thing for you.
https://www.shiksha.com/resources/college-comparison
Please click on the link above. This is the online college/university comparison tool of Shiksha. This tool will show you all the difference between the colleges on various parameters and you can decide the best college easily.

https://www.shiksha.com/b-tech/ranking/top-computer-science-engineering-colleges-in-karnataka/46-2-106-0-0
Please click on the above link to get a list of good B.Tech in CS colleges in Karnataka. Choose the best college for you by comparing the colleges using:
https://www.shiksha.com/resources/college-comparison

Yes, there are many colleges in Agriculture in Mumbai:
https://www.shiksha.com/science/colleges/b-sc-agriculture-colleges-maharashtra

10+2 or its equivalent with a minimum of 50% marks in mathematics and physics. (If you don't have physics & maths in 10+2 you have an option of doing these two subjects from National Institute of Open Schoolings On-Demand Examinations and can still start your Pilot training course. Visit www.nios.ac.in for details)
At least 16 years of age to start pilot training. Vision in one eye must be perfect. (6/6 eyesight) In the other eye, you could have an imperfection of 6/9, which must be correctable to 6/6. You must be free of any disease that can hamper normal function.