Science

You can try for startups based on travelling services. You can start writing blogs and good ones will definitely be appreciated and show case your abilities. You also need to work on skills like website management, social media management, bit of marketing, pitching editors/brands. The more you reach out to number of people, more opportunities you will get.

Yes of course, you could take admission after class 12th, but don't worry, if you have done B.Sc, You can give entrance examination for MBBS course like AIPMT, STATE PMTs, because they have eligibility criteria for only class 12th with biology. If you don't get selected, then you can go for private colleges, if you are rich. But, there is no use of your B.Sc Degree in entrance.

One of the institute is Symbiosis institute of geoinformatics
For detailed information visit the college link
https://www.sig.ac.in/enquiry/?utm_source=google&utm_medium=search
To know about more colleges that provide M.Sc in geoinformatics visit the below Shiksha link https://www.shiksha.com/science/colleges/m-sc-geoinformatics-colleges-india.

Yes, geology is available in CSJMU.

Yes, they can appear for IIT JAM physics.

Yes, you can go for the same but before that just explore and search in depth what you are opting for.

Yes, you are eligible but there is hardly any scope of electronics engineers as there is no work association with an electronic engineer.

Hi Aditi,
Yes, you can apply for JNU by giving its entrance exam.
Good luck

No, Quantitude, Aptitute, Logical, GK, English etc. comes in CAT course. So, don't worry.