How is Dux of Macleans College calculated?

how is it calculateD? i am very curious

Hi, I’m a ex-Macleans student.

Macleans College Dux is based purely on NZQA Scholarship results in a single year.
Usually the ranking is done based on what NZQA would rank you

e.g Premier Scholar > Outstanding Scholar
e.g More scholarships, higher rank
e.g Outstanding Pass>Normal pass

Hope that helps.