Hello, I hope you are doing well

OBC Certificate issued from Delhi NCT is only valid when your caste comes under the Central Delhi OBC Caste List. There are many castes which fall under OBC as per Delhi NCT list but not under the Central Delhi OBC Caste list.

So, you cannot avail the benefit of OBC Quota, you can still register for exams and counseling as a general candidate.

Hope this helps.