One was on a poem he had read during the year, another was on a novel and two were about plays - Shakespeare's Romeo and Juliet and Arthur Miller's The Crucible.
Yang told Checkpoint he was surprised when he saw his results.
"I'd written what I felt about the literature and my opinion towards it, and I thought that that would have been good, but I wouldn't have actually expected to score so well.
"I was very excited because I never expected to get such a good score. I wasn't really expecting top of New Zealand or top of the world."
Yang said he was very thankful that all the hard work he did paid off.
"You aim for the 100 but you never expect it, but you want to work at it to get it and like, even if I don't achieve a 100 like even in my school career, I'm pretty satisfied with that. Like if I get good grades."
He not only scored exceptionally high for English but also scored 93 per cent for math.
However, he said he's always been more inclined towards social sciences but didn't choose those subjects.
"I guess the word prowess is very suitable here, like that kind of ability just carried over to English and I really enjoyed it a lot."
- RNZ