[3] As a sophomore, Holland took a leap in stats and averaged 13.8 points and 10.1 rebounds per game, leading the Duncanville Panthers to win a second straight Texas Class 6A state championship.

[4] As a junior, Holland led Duncanville to a 35–1 record and a third consecutive state championship while averaging 15.9 points, 7.9 rebounds, 2.9 assists and two steals per game.

Holland compiled over 1,500 points and 900 rebounds during his four years at Duncanville, helping the Panthers finish ranked nationally in all four seasons with a pair of state titles.

[10] On November 5, 2022, Holland committed to playing college basketball for Texas over offers from Kentucky, Memphis, Kansas, Arkansas, Oklahoma State, UCLA and Oregon.

[25] The following summer, Holland played for the under-17 team at the 2022 FIBA Under-17 Basketball World Cup and averaged 11.1 points and 6.6 rebounds over seven games.