Hy kashika!! 

About DU you must know that du takes admissioms on the basis of your best four subjects . if you score good percentage in any four subjects in your 12th standard, you may get admission in DU. These percentage should be above 85% in order to get a college affiliated to delhi university.

With 71% marks it is very difficult to get admissions in DU. I would suggest you to look for some other university for your admission.

All the best