Exum akatambira chikwata chenyika chechidiki cheAustralia pa2012 FIBA Under-17 World Cup, kwaakatumidzwa kunzi All-Tournament Team, pamwe ne2013 FIBA Under-19 World Cup
, kwaakadanwazve kuti ave muTeam yeAll-Tournament. 2013 yakaratidzawo kutanga kwaExum kwechikwata chevakuru chenyika, vachitamba neNew Zealand pa2013 FIBA Oceania Championship. Muna 2014, akatamba kuAustralia ku2014 FIBA World Cup, kwaakawana mavara 2.7 mapoinzi, 1.5 rebounds uye 2.0 anobatsira mumitambo mitanhatu.