Great - thanks for that @Sam91
What I forgot to comment on was Auckland University offering papers specifically for secondary students. They've set up a maths paper jointly run by the Engineering School and Science departments so that secondary students who have already completed NCEA can still study maths, prepare for UE scholarship maths exam, achieve some level 1 university credits and complete the prerequisite for stage 2 mathematics. What I am also excited about for my son is that he will get a look at university life before he starts full time, and know what to expect when he does.
This is just a fantastic opportunity and kudos to University of Auckland for offering it. I'd never heard of it, and only found out by accident from his school when we were talking to their advisor about his Y13 subject options.