A lot of people have a PO box as their address, out in the boonies there is no door to door postal service and you can rent a PO box from Canada Post or UPS. Not sure if you can have that as the address on your license though?
The test itself is mainly the pre trip and air brake stuff, as Jimmy said, just learn it parrot fashion and it’s easy, the driving part is ridiculously easy, but many a driver with 20+yrs on artics in Britain has still managed to fail it, some more than once! Bad habits I guess, but for the record I passed first time, despite the bad habits lol