This would have probably been better in the Miltiary Aircrew forum.
Depends - are you still on the UAS? I doubt it, otherwise you would already have the answers you require.
Did you complete EFT?
There are dispensations regarding the exams but I am unsure of them.
Regarding NAV. I assume your above average so you'll prob need about 1-3 hours training and a cross country qualifier. 150nm with two landings away from the home base (signatures required)
Good luck in NZ.