Hey,

It won't be possible for you to secure a seat in North  campus colleges of du even if you belong to  obc category.  But then it also depends on the course you are willing to choose. For courses like ba programmes the cutoffs are generally low. But still it would be very difficult for you to get any north campus college with 71%. You may still try for other du off campus colleges for ba programme courses.

Hope you get this, if not do ask!

Good luck!