Hello aspirant
hope you are doing well and safe. With reference to your query, I would glad inform you that in the most of the documents of 12th originals are already signed by principal of school , so their is no need of any sign but in photocopies they should be self-attested with latest date . thats all you need to do while mbbs admission
Hope you found this answer informative. Best wishes for your future
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile