B.Sc

You can work in a lab as an assistant for a factory or school. You can attempt government exams for various posts and vacancies. These are the only major jobs you can do. Although you won't get them easily.

If your current college is affiliated to MGU, only then it is possible to do so. But then again, you will have to check if there are seats vacant in MGU and state a proper and solid reason for the change.

B.Sc. in Agriculture has better recruitments in government departments. Fishery is also good but it is not better than Agriculture. The demand of Agriculture is in nearly every department like Banks, Public welfare, Forest departments etc.

https://www.shiksha.com/university/mahatma-gandhi-university-delhi-31438/courses/bsc-bc
This link has the information you need. Scroll down the page, you will also find reviews about college.

Hi Priyanka!
The minimum eligibility for this course is a Bachelors degree with 50% aggregate score. However, there are some institutes that may require the candidates to have an Honors undergraduate degree in Psychology or Psychology as a subject in Graduation for becoming eligible for this course. You will have to consult the university about the same.

Hi,
Register and Apply
Interested candidates can apply online/ offline with required information
Personal Interview
Shortlisted candidates will be called for personal interview based marks obtained in 10+2.
Counselling
Admission is through counselling based on the marks obtained in personal interview.
https://www.shiksha.com/nursing/course/b-sc-in-nursing-bvdu-college-of-nursing-navi-mumbai-navi-mumbai-294283

First, if you want to take online admission, first Google the name of the college. Open the official site of the college there you would see admission notifications. 1st register your self then follow application procedure i.e. Filling details, uploading your documents like aadhar , 12th mark sheet , 10 th mark sheet, caste certificate if any, and then pay the application fee. This way, you can seek admission in any university.

Hi, https://www.shiksha.com/engineering/exams/jnu-ceeb.

Aircraft engineering is of 4 years. For more details, check out the link below:
https://www.shiksha.com/b-tech/course/b-tech-in-aerospace-engineering-sandip-university-nashik-274736

No, they din't. You should have good marks in 12th for admission there.