Hello Azra Khan !
So starting of I must tell you that the minimum aggregate required to go for admission in Delhi University is 60%.
But blue 75 all let's take it 70 or don't think the admission is possible in Delhi University. Talking about commerce courses the cut off goes way higher as compared to other courses.
Commerce courses do not have any entrance exam for the selection for admission purposes . It's admission is merit based.
Entrance based courses are:
Bachelor of Business Administration
B.A. (Hons) - Business Economics
B. Tech.
B.A. (Hons) - Humanities and Social Sciences
Bachelors of Elementary Education 
B.Sc. in Physical Education, Health Education & Sports
B.A. (Hons)