Science

Yes, I think you will get seat in B.Sc Agriculture with below INR 7 lacs for 4 years, because your percentage in inter is very good. So, there is full chance that you get seat in your stream in South India.

I don't think, but there is 70% chances that you'll get BHU B.Sc Agriculture.

Absolutely, your selection is fixed by the Faculty of Social Science, BHU. Wait for the result declaration. In the 2nd week of June, the result will be declared.
Good luck.

Your admission will be based on your marks in PCM with one language. Every college is good in DU if you are interested in studies and giving regular time to it, but still, if you are interested, then google about top DU colleges for Maths (Hons), you will get your answer.
All the best.

Yes, you are eligible for B.Sc in hotel management. You can try to get admission, you will get admission. But take admission in a good college so that you get good career opportunities in the future.
Good luck.

A candidate can apply for the IES and ISS examination if he has got PG in Economics/Applied Economics from a recognised university for the IES exam. He has the Post Graduate Degree in Statistical/Mathematical Statistics/Applied Statistics for the ISS Examination. Candidates appearing for the examina

DAVV is well and good as compared to Holkar. You will get more benefit than Holkar in DAVV in terms of culture, environment and placement.

https://www.shiksha.com/it-software/colleges/b-sc-colleges-india
This link will make you get through all your queries and answer to your questions.
All the best.

Yes, you are eligible. A candidate should have passed
B.Sc (Hons) in the respective subject.

Yes, you are eligible.
Indian applicants with a Bachelor's degree in any discipline (including those in the final year of graduation) with a minimum of 60% marks in the core subjects are eligible to apply. Central, South and Southeast Asian nationals with similar qualifications are also eligible.