Dyal Singh College, University of Delhi

Yes, you can take admission after 2nd cut-off, but you should fulfill the condition that you are eligible to take admission as mentioned in the cutoff.

I think, Dyal Singh is the best for B.Com with 87%.

Dyal Singh College is better than Motilal Lal Nehru College because of its faculty members. The administrative staff is very cooperative in Dyal Singh College. Dyal Singh College has a better communication than Motilal Nehru College. Dyal Singh College situated near a metro station and a bus stand. The college location is the best.

If you are pursuing political science and you have not studied this subject then there will be a deduction of 2.5% from your best 4 subjects marks, check against the cut-off released by DU.
If you change your stream then 2.5% is deducted from the best 4 subject's percentage. If you add physical education in best 4 subjects then also 2.5% will be deducted. For further information regarding deduction, visit DU website.

ARSD is better option than Dyal Singh college because ARSD has better faculty for this course than Dyal Singh College.

Minimum percentage is required to get admission in Dayal Singh College for B.Com is 90% above.

After DU declares the cut-off list, a candidate needs to take admission within 3 days, if he fails to do so, the seat will be allotted to the next candidate.

Yes, you can definitely get admission in DU.

No,
You will not get admission in BA Hindi in Dyal Singh College. Last year, its first cutoff for general category was 80%.

Fill up the form of Delhi University and after that checkout cutoffs of various colleges of Delhi University. I am not sure that you will get admission or not. It all depends on cutoffs. Maybe you get admission because of SC category.