Hello, I hope you are doing well

Since you have done you Class 10th and Class 12th from Delhi, so you will get the benefit of Delhi quota.

You also said that your caste comes under OBC NCL Central List, so what you will have to do is get a OBC Certificate issued from Delhi. Only then you will be able to avail the benefit of OBC Quota, because if you were a outside Delhi candidate then you could have used your current certificate but since you are having Delhi quota you will have to get a new certificate.

Hope this helps.