Hello Abhishek, Based on 2018 closing ranks and given that you are from SC category you can get top colleges like Hans Raj College, Hindu college, ramjas college and many other top colleges under DU. I am providing a link below to the 3rd round cutoff of DU in 2018. go through it and then finalize your college.

2018 DU arts and commerce cutoff after 3rd round: http://www.du.ac.in/du/uploads/Admissions/Cut-off/2018/3rd%20Cut-Off%20-%20Arts%20&%20Commerce.pdf

You can easily get admission DU because you secure nice marks and belongs to SC category as well. You have to go for it. 

I hope this information will help you. 

Good  Luck  !!