Hawke's Bay Special Needs Taekwondo director Ben Evans described Johann Landkroon as a "walking library".
"If I lost my mind and forgot my theory one day Johann would be the one to help me," Evans said.
He was reflecting on Landkroon's successful verbal theory segment on his way to gaining first degree black belt status during a day-long examination this month.
Various patterns had challenging words but Landkroon, who has Down syndrome, remembered every word in the correct sequence.
The day began with a floor performance involving several physical requirements which was followed by a fitness test before the verbal theory segment.