Delhi University (DU)

The minimum criterion of eligibility needed to be met for admission to the course is a 10+2 or equivalent qualification from a recognised institute/university with a minimum aggregate score of 50. Candidates awaiting their final examinations results are also eligible to apply on provisional basis.

ELIGIBILITY OF THE Bachelor OF ARTS [BA] (POLITICAL Science)
For admission to B.A. A. In Political Science course, a student must have passed theirIntermediate or 10+2 examination any stream from a recognised board or university with a minimum of50% marksin aggregate. Certain colleges prefer students

The minimum criterion of eligibility needed to be met for admission to the course is a 10+2 or equivalent qualification from a recognised institute/university with a minimum aggregate score of 50%. Candidates awaiting their final examinations results are also eligible to apply on provisional basis.

No, you can't get admission with this percentage.
However, from SOL, DU, it is possible.

No, your percentage is too low for DU but you can check the cut-off list.
Private colleges are providing admission.

Yes, if you have a quota, otherwise not.

Yes, your friend is eligible to get admission in DU.

The best four subjects percentage is important, so first calculate the that and then the cut-off of 2018 will decide if you are eligible for B.A. English Hons. or not.
Also, every college offers different cut-offs for different courses.

http://englishdu.ac.in/index.php/news/ma-english-entrance-test-sample-paper/
You may go to this link and download them.

Kirori Mal College, Shivaji College, Miranda House, and Shaheed Bhagat Singh College are the best for Geography Hons.