UE depends on what decade you went to college/high school? In my time it was a score of 20 or less in yr best 4 subjects in 6th Form. Nowadays its based in NCEA level 2 credits I think. Of course, level 3 and bursary quals give you UE as well.
You can can go to the NZQA website to see what equals what, and also apy to confirm what UE equivalence you have.