Iwundu was recruited by coach Bruce Weber to Kansas State out of Westfield High School in Houston. He would go on to be a starter from the beginning, breaking the Wildcats' career record for games started with 124. He came in as a part of a heralded 5-man 2013 recruiting class, but ultimately was the only player who stayed at K-State past two seasons. His perseverance paid off, as he was named third-team All-Big 12 Conference in both his junior and senior seasons. For his senior season, Iwundu averaged 13.0 points, 6.3 rebounds and 3.5 assists per game.