Delhi

Chances are moderate, try for the below mentioned colleges:
https://www.shiksha.com/bba/colleges/bba-colleges-Delhi?rf=filters&ts=2018813&ct[]=74&co[]=Public&uaf[]=location.

https://www.shiksha.com/bba/colleges/bba-colleges-Delhi
The top colleges are given above according to the descending order for BBA in Delhi region. All the best.

Minimum 50% marks is a must for BBA. Although, since you are nearby, it can be relaxed if your SSC scores are good and that shall depends on college admission committee. Thank you.

If you wish to study for JEE Mains and Advance then Kota is better than Delhi as it has a good atmosphere and support.

You will have to complete your 12th first because for any graduation degree, you need to have passed in 12th first.

For getting admission in JNU, please look into the website of jnu.ac.in. The details are given. My personal suggestion will be please go and visit JNU campus a friendly environment with beautiful plants and flowers a good security. You are in need to visit Administrative block where you can go for inquiry section. The people inside the campus are quite helpful they will guide you through the process of admission and good food are also available there.

Please clarify, which course do you want to pursue in your Masters degree, so that I can guide you better?