"I don't really think about winning. If I hit my personal bests, I'm happy because you're not always going to win so to set a goal for my PBs and not just to win, I think that's the best."
Nikolas, who started athletics at 8 years old, said he was pleased he had beaten older opposition because it showed his commitment to succeeding.
"It's about dedication because I don't think about age because at some stage you'll all be throwing the same so its just dedication to your training and preparation."
Nikolas trained twice a week at Kensington Park with other athletes and used sprinting and the gym throughout the week to keep fit. He said working with other athletes helped him when it came to competing.
"I don't want to separate myself too much from the other guys training here because I like socialising when I'm training. It helps because when I'm throwing they are talking and making noise so then you learn to block them out and throw."
Nikolas said shot put was his favourite out of the three events because it was a good way to release anger and nerves.
"I do like shot put because when you get angry you can put more effort into it. My first throw is always when my nerves get to me but I've been taught to use my nerves to my advantage."
Father and coach Sa, said coaching him now reminded him of when he raised his children.
"It's like coaching them when they were young showing them how to walk.
"We spend a lot of time together when he was growing up and now he's 16, we are still together. The thing about him is that he doesn't give up easily, he's got that fire inside him."
Sa said he made sure he was honest with his son so Nikolas knew how hard he needed to train to achieve his goals.
"If you want something you've got to go and get it. No one is going to give it to you. What you put in is what you get out. It's about being humble."
When he first got into athletics, Nikolas didn't perform as well as he does now, but his father said this was what gave Nikolas the motivation to get better.
"When he started when he was young he would always lose but now he's really hungry to train so maybe the losses were good for him to bring that hunger out of him."
Sa said he was very proud of his son's achievements and hoped his son could make a career in athletics.
"As long as he's happy with what he's doing, I'll be happy. I hope he can go really high, like go to the Olympics, that's the number one hope. If he gets the support he needs, he has that fire in him so who knows what will happen."