Hi Saketh,

I would suggest you fill in some more details while asking your question such as which entrance examination you are referring to.

Anyways, in order to upload your OBC-NCL certificate you have to first login into the official student portal of the entrance examination you are interested in and then go to your application and then upload your document in the online submission portal.

The exact date for the upload can only be told only if you give us the name of the entrance examination you are referring to.

BEST WISHES!