Nick Kyrgios has declared for the first time he wants to become the world No.1 tennis player and has given himself five years to do it.

The Australian No.1 has faced media scrums the world over but he didn't expect the hardline questioning that came his way on a school visit back home in Canberra on Wednesday.

Australian No. 1 Nick Kyrgios says he wants to rise to the top of world tennis in the next five years. Credit:AP

Students hit Kyrgios with all the tough questions - asking where he'd be in five years, what he'd do without tennis in his life and why he plays the sport at all.

Kyrgios embraced the interrogation with the honesty which has made him a walking headline since bursting onto the scene as the teenager who defeated world No.1 Rafael Nadal at Wimbledon in 2014.