Jensen Au Yeung was doing basic maths by 2 and algebra by 3. Now aged 10, the Auckland boy is making friends with teenagers after skipping five grades at school.
Jensen, who loves Lego, his dog Fluffy, and also plays representative football, moved to ACG Senior College last month and is the youngest (and smallest) "by miles".
But he says he likes it anyway.
"Here it's 100 per cent at my level," Jensen said. "It was a big jump with maths because there's papers in statistics and lots to learn, and there's quite a lot of homework, but that's okay."
Jensen's parents, who also have a 6-year-old daughter, noticed he may have special skills when he was 2, as he could pick different countries on a map and do complex sums involving negative numbers.