Biliew grew up in
West Des Moines, Iowa and initially attended
Dowling Catholic High School. He averaged 6.2 points and 3.6 rebounds per game as a freshman at Dowling Catholic before transferring to
Waukee High School in
Waukee, Iowa before the start of his sophomore year after initially stating his intention to transfer to Hillcrest Prep Academy in
Phoenix, Arizona. Biliew averaged 10.9 points, 7.8 rebounds, and 3.1 blocks per game as a sophomore. He transferred to Link Year Prep in
Branson, Missouri after his first year at Waukee. Biliew spent his junior year at Link Year, but transferred back to Waukee after the end of the school year. Biliew was selected to play in the
2023 McDonald's All-American Boys Game during his senior year.
Recruiting Biliew was a consensus five-star
recruit and one of the top players in the 2023 class, according to major recruiting services. On July 26, 2022, he committed to playing college basketball for
Iowa State over offers from
Kansas and
Oregon. Biliew also considered playing professionally in the
NBA G League. He is the highest-rated recruit to commit to Iowa State in the program's history. ==College career==