 Maragkos played high school basketball at the private Blue Ridge High School, in Saint George, Virginia.He led his team to a 20–7 overall record, and a VISAA state semifinals appearance in 2012, averaging 10.9 points, 6.5 rebounds, and 1.3 blocks per game.Maragkos played college basketball at George Washington University, with the George Washington Colonials, from 2012 to 2014.