He sat biology and English at Level 2, while the remaining subjects were sat at Level 3.
This year he was continuing with high school but also doing papers through Waikato University.
He was nervous about opening his results.
"It's a great accolade to be acknowledged at the top of your school, but the uncertainty nationally is something else," he told the Bay of Plenty Times.
It was hard to know how many hours of study he put in last year, he said.
He began extension learning at the start of last year but began studying seriously for his exams in term 3.
Jack said he hoped to study science at either Otago or Victoria next year, then go on to do his masters.
New Zealand Scholarship
Assessment for New Zealand Scholarship is held externally at the end of each school year.
Generally, New Zealand Scholarship assessments are undertaken by Year 13 students, most of whom are also studying towards NCEA Level 3. Each New Zealand Scholarship assessment carries two passing grades - Scholarship (S) and Outstanding Scholarship (O).
NZQA aims to provide New Zealand Scholarship results to candidates about mid-February in the year after assessment.