Kammala jumla mai zuwa: A shekara ta 2016, Curbelo ya lashe lambar zinare tare da Puerto Rico a Gasar Centrobasket Under-15 a Patillas, Puerto Rico bayan da ya samu maki 16.5, tarawa bakwai da kuma taimakawa 6.5 a kowane wasa. A 2017 FIBA Under-16 Americas Championship a Formosa, Argentina, ya zira kwallaye 21.8, 7 rebounds, 3.2 taimaka da 3.5 sata a kowane wasa kuma ya lashe lambar tagulla. Curbelo ya fafata a gasar cin kofin duniya na FIBA Under-17 na 2018 a Ajantina, inda ya samu maki 13.6, 5.6 da kuma tallafi 5.9 a kowane wasa kuma ya jagoranci tawagarsa zuwa wata lambar tagulla. Ya yi matsakaicin maki 11.1 da 5.6 yana taimakawa a kowane wasa a
2019 FIBA Under-19 World Cup a Heraklion, Girka yayin da Puerto Rico ta gama a matsayi na shida.