Tristan Owain Pang of Auckland smiles mischievously when you ask him what his favourite subject is.
"I like them all ... but obviously I'm quite good at maths."
The 10-year-old Ficino School pupil is being modest. Last year he sat the IGCSE mathematics exam through the Cambridge international exam system and top-scored with 97 per cent.
Tristan was New Zealand's youngest-ever candidate - "and quite possibly the world's", says mother Elaine Pang - to sit the exam, normally done by students in Year 11.
Peter Crompton, his principal at the Mt Eden school, said he recognised Tristan's unique capabilities when he first joined the school three years ago.