Just waltzing in a getting a check ride in a 777 is a very tall order.
I don't remember all of the inz and outz of the process but you basically going to have to go to PanAm or another training provider. PanAm (and formally Aero Services) do offered shortened courses for those that already have time in the airframe.
I assume that you are trying to get a foreign 777 type put on your US ticket.
That same question popped up here a couple of years ago so you might want do do a little digging.
TCE=Training Center Examiner