Science

Yes, of course, you are. Even you have few attempts left.

You have to clear TANCET:
Admission Process
Register and Apply
Interested candidates can apply online/ offline with required information
Merit Screening
Admission is based on score obtained in Tamil Nadu Common Entrance Test (TANCET).

Yes, of course, DU offers B.Sc in various streams. Do check the DU website for more information regarding to the programme.

Please mention your category.

ICAR is a prestigious institution that grants admission to the best Agriculture Universities and colleges. For cracking ICAR exam you just need to revise thoroughly your 11 and 12th syllabus, whatever your subject is.

You should first clear your maths and pass in it. Only after that you will be eligible for any UG course. But you can do Diploma on 10th basis.

Hi Hafijulah,
First of all, my hearty congratulations for your ambition. For becoming rocket scientist pursue Aerospace engineering in Indian institute of space Science and technology in Tiruvanadapuram. And must secure with at least 65% in all semesters. Then definitely ISRO will hire you.
All the best for your future.

Basic 10th and 12th syllabus in physics and chemistry should suffice.

You can Apply for NDA exam after class 12.

No, not at all. For pursuing B.Sc Agriculture, you need to pass your class 12 from science stream bio, maths, Agriculture, etc.