Hi Ritik, 

Yes, it's possible for you to get dmission in a good DU College. The previous year cutoff lists are available on the official website. Delhi University will start releasing 2019 cutoff from 14th June onwards. 

For top DU colleges, the cutoff is almost above 90% for SC candidates. It also depends on the course you wish to apply for. From previous year data, the cutoff for the Hindu college was above 90%. The cutoff for Kirorimal College, Deen Dayal upadhyay college are around 85 to 90%. Cutoff for B.Sc. Botany was comparatively lower. In the subsequent cutoff lists, the cutoff may lower upto 80 % for SC candidates. So, you need to wait till the last cutoff list.

you can check out the link below for previous year cutoff of DU Science Colleges:

https://university.careers360.com/articles/du-cutoff