Hello aspirant

hope you are doing great. As per your query  I would glad to tell you that school leaving certificate is already signed by prinicipal of the school and it is also original but you have to submit self -attested xerox of the originals at the time of document verification for admission . Infact all of your certificates should be self -attested xerox and have to be submitted at the time of admission

Hope you found this answer helpful. Good luck for your future