Koran is not based on Old Testament or the New but on the Mohammad views. Muslims believe that Koran CONTAINS all teaching of the Bible and that the Bible owned by Jews or Christians is corrupted and to be avoided.
I'm familiar with the teachings of all three. I am aware that despite its claim to Abrahamic tradition, Islam is nothing of the sort other than its acknowledgement that God is One; whereas Christianity, to its eternal credit, recognizes the truth of the Torah, and the difference is in the interpretation rather than the substance of scripture.