documents required for extension of F1 visa

This is KRANTHI KUMAR, pursuing Masters in Texas A and M University Kingsville. I
want to know the information regarding the extension of my F1 VISA, as it is valid up to
31 august 2017. I will complete my Masters on December 2017, for which I need to extend
my F1 VISA. Please can you let me know the required information and documents which
are necessary for extension of my VISA.