just want to ask a sample of authorization letter that allows me to get certain documents in a university?

Answer 1

This is a little confusing. If you want a copy of your own transcript, most schools now have standardized forms, available on their websites, which you can fill out. I can't imagine what other kinds of documents you might be authorized to get from a university, even with a letter, unless you are a government official or an attorney suing the institution.