Carroll is 6 ft 6 in (1.98 m) tall and weighs 212 lb (96 kg; 15.1 st). He played high school basketball at Hatboro-Horsham High School in Horsham, Pennsylvania under coach Walt Ostrowski. He played college basketball at the University of Notre Dame.

At Hatboro-Horsham High School, Carroll averaged 26.5 points, 7.3 rebounds and four assists per game as a senior shooting guard. He recorded even more rebounds and assists his first three seasons, when he started at point guard for the Hatters.

At the end of high school, Carroll ranked second in scoring in the history of southeastern Pennsylvania, trailing only current Los Angeles Lakers star Kobe Bryant. Carroll surpassed Bryant by becoming the only Pennsylvania player to be named Mr. Basketball twice.

Basketball gurus around the nation noticed, as they twice selected Carroll for the United States Junior National Team. That selection teamed Carroll up with players such as the Orlando Magic's Michael Miller, Stanford's Casey Jacobsen and Arizona's Michael Wright to compete in the Dominican Republic in 1998 and Portugal in 1999.

In addition to the U.S. junior national team, Carroll made it onto the roster for prep all-star games such as the Magic Johnson Roundball Classic, where he finally had the chance to play for his grandfather, and the Capital Classic in Washington, D.C..

He was recruited by coach John MacLeod, played for Matt Doherty as a freshman and played the rest of his college career for former Delaware coach Mike Brey at the University of Notre Dame.

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