If you are a year 11, 12 or 13 student, wanting to get hold of some practice exams, then head over to http://www.nzqa.govt.nz/ncea/for-students/exams/index.html
This site allows you to search for past exams, and their marking schedules.
For exams, enter your year level, and subject (e.g. physics), and the drop down arrow should say "exams & exemplar"
For the marking schedules, same as above, but the drop down arrow should say "reports & schedules"
It's best to have a go at these in exam conditions, and then mark them yourself.