Transfer to Kenan-Flagler

Hi guys,
I am an international student who will enter University of Washington in Seattle as freshman this fall. I really want to transfer to Kenan-Flagler…I heard that every student need to study in UNC Chapel Hill for at least one semester before entering Kenan-Flagler. Can anyone give me some advises about transferring from another University? What’s more, what kind of preparation should I do?
Thanks…