 Okongwu shared MaxPreps National Freshman of the Year honors with his teammate, LaMelo Ball, after averaging 7.9 points, 7.2 rebounds, and 3.1 blocks per game.As a sophomore, Okongwu helped Chino Hills reach the CIF Southern Section Open Division semifinals and the CIF State Southern Regional semifinals.In his junior season, he led his team to CIF Southern Section Division I and CIF Division I championships.