Assuming asking for B.com, The admission is based on the merit list. The best four academic subject of 10+2 will be calculated for the programme. if you meet the required percentage then you can get admission.

If you are interested in BBA then there is entrance exam in DU which is DU JAT. 

Here are The top colleges in Delhi University for B.com

1. Shri Ram College of Commerce
2.Hindu College
3.Hansraj College
4.Sri Venkateswara College

You can check this year cutoff with given below link.

DU cutoff

Good Luck!