CBSE 12th

Hi Nikhil, research will come later, first you complete your bachelor degree in either mechanical or automobile engineering to understand the field. Gain some work experience. You must then go for a integrated M.Sc/Ph.D or simply a M.Sc and then a Ph.D.

You can opt BCA or B.Sc IT or B.Tech CSE.

Hello Bhoplu, please complete your Bachelors degree or a job oriented course in an area of your choice. The higher your qualification better the chances will be.
With class 12 qualification job opportunities will be limited to very novice jobs or you can check government jobs like
Lower Division Clerk
Postal Assistant
Data Entry Operator
SSC Stenographer
Railway clerks and constables
Ticket collector
Assistant loco pilot
Indian Coast Guard
Indian Navy
Indian Army
Take UPSC or SSC exams.

Hello Vaibhav,
Your rank under catagory is quite well. I feel you have very bright chance of getting admission in one of the NIT's. Which one is difficult to guess but you will get admission.

Depending on the kind of job you plan to do, you can choose from among the many options on the list below:
https://hospitality.shiksha.com/aviation-courses-in-india-categorypage-6-87-1-0-0-1-1-2-none-1-0?

Yes for preparation of civil services, it would be beneficial. But you continue with commerce that would be more beneficial for you.
Good luck.

Can't get admission where?
You should try BCA, B.Com, Diploma courses, etc.
Good luck.

Hey,
If you are interested in business in IT field then B.Tech is better for you from a good institute and after that, you can do MBA.