Hello,

Hope you are doing well.

If your document is officially made then it will require no additional signature as the signature of the aspirant is taken at the time of the preparation of the document and once the documents have been made and officially declared, then no such over-writing is allowed.

But, most of the times at the time of conselling the college asks you to sign at behind or bottom of your documents for avoiding the mixing of your documents with the others and so that it can be identified if ever gets mixed with other documents.

Hope this will help you.

All the best for a bright future!