It is the power train that determines the shift points not the truck manufacture. With a late model truck I would try to shift progressively. Just get it moving maybe up to 1100 RPM then shift. Then slightly higher RPM and shift and so on. You will tell real fast if the trucks computer is set up for this kind of shifting. Who knows your tester might tell you what the limits are or it maybe marked on the tach. As for shift points I would guess 1300 to 1500.
Don't panic too much about shifting. Everyone, except me,

has ground a few or missed one even on flat ground. You will get the feel for the truck in a short time. Watch the terrain so you get an idea what to expect on how fast/slow you will loose/gain speed.
Personally if I was testing you I would watch more how you handle the truck, and how you watch all around you mirrors, ahead, behind, traffic. etc.
Good Luck.