Atma Ram Sanatan Dharma College, University of Delhi

Yes, you can do BA programme. There will be deduction in percentage because you are changing your stream.
All the best.

You can compare both these colleges with the help of this amazing tool.
https://www.shiksha.com/resources/college-comparison

See in terms of placements, faculty and infra, I'll suggest you to opt for the Deen Dayal college.

Yes, you can apply for B.Sc Physical Science with Chemistry in ARSD College.
Good luck!

You have a very good score in commerce stream from CBSE board, so you can apply for AtmaRam Sanatan Dharma (ARSD) college for admission.
Good luck

You can definitely wait, but you may never know that there will be seats left after the first cut off or not, so keep that in mind. Mostly, for the best courses in DU, the seats get full in the first cut off only so they don't release a second cut off for that course. If you are getting admission in the first cut off, but you don't take it right now, you won't be able to get it later.

For answering your question I am attaching a link below :
https://www.shiksha.com/college/atma-ram-sanatan-dharma-college-dhaula-kuan-delhi-23865/admission

It will be difficult for you to take admission with such grades as the cut-offs for BA (economics) is a bit higher. You can try if you have a quota or something. All the best!

ARSD is a college of University of Delhi.
You have to first get yourself registered on DU on its portal.
Then, after 2 weeks, they introduce their cut-offs you can get yourself admitted in any college in which your % lies.
You can check the site www.du.ac.in or www.arsdcollege.ac.in