Kammala jumla mai zuwa: Exum ya taka leda a tawagar matasa ta kasar Australia a gasar cin kofin duniya ta FIBA ta 2012 karkashin shekara 17, inda aka sanya shi a cikin 'Yan wasan Gasar, da kuma
2013 FIBA Under-19 gasar cin kofin duniya, inda aka sake sanya shi a cikin All-Tournament Team. 2013 kuma ya nuna farkon Exum ga manyan 'yan wasan kasar, suna wasa da New Zealand a 2013 FIBA Oceania Championship. A cikin 2014, ya buga wa Ostiraliya wasa a gasar cin kofin duniya ta FIBA ta 2014, inda ya sami maki 2.7, 1.5 ya dawo da 2.0 ya taimaka a wasanni shida.