Delhi University (DU)

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https://www.shiksha.com/resources/college-comparison

The cut off list has the details and the eligibility for all the categories mentioned separately.

Admission for economics is held on the basis on cut-off. You should focus on achieving the highest possible marks in 12th.

Yes, you can but it also depends on yearly cut-off too.

M.Sc Course-Eligibility
Pass Undergraduate degree.
Appearing Candidates can also apply.

Switching from a regular to correspondence course might not be permitted. You may have to quit your B.Sc. course from DU and then take up a correspondence course starting from first year. If you have been selected in the Navy, I would advise you to prepare for starting with them.

The scope of International Relations is moving towards the peak of new age careers, and the field offers great opportunities in varied spheres of economy. IR is a good base for high-level administration, investigation and analysis work in a number of professions.
1. Civil Services - You can join the

Based on your educational qualifications, it is recommended that you may opt for marketing or HR specialisation in MBA. Both specialization have good job and growth opportunities.

Which course you are opting for? There is an option for provisional admission in DU but depends according to the course.

If you have not filled DU admission form, you can not seek admission in any of DU affiliated colleges directly.