B.A

Dear aspirant, you can apply for LLB in any college that is suitable for you, and you are eligible.

Hello Rishabh,
It's indeed very nice to see your enthusiasm for studying. You can download the application form of Mumbai University & I would advise you to download same of IGNOU also. Then you can decide which course to select. Normally, 12th is the eligibility. Check if these two accept Diploma as equivalent to class 12th. If not, you will have to complete class 12th. This you can do from NIOS.
Best wishes.

Shivaji College is better than Rajdhani College because of its faculty members.

yes it's depends upon the cut offs

yes you will get admission.

There are some chances of getting BHU. You can try to get admission.
https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&grqid=MGYL-eCx&s=1&hl=en-IN
Here, I am sharing college predictor link. You can go through to know about the college you can get.
Good luck.

Yes maths marks are mandatory for BA Hons in economics in DU.

Three Simple Steps for Applying Online for BA in DAV centenary college:
Fill in the basic details and note down the System generated Registration ID and Password.
Fill the online Application Form, upload your photograph, signatures and the required documents.
Make payment of the Admission Processing cum Admission Brochure Fee through Credit /Debit Card/Net Banking.