Jarrett averaged 4.8 points through 12 games at Kennesaw State before leaving the program.[4] He moved to Three Rivers College, where he averaged 29 points as a sophomore and led his team in five statistical categories.[3] He was dismissed from the program for violating team rules.[4] For his junior season, Jarrett transferred to Jackson State.[5] As a junior, he averaged 16.8 points and 3.4 rebounds per game, earning Second Team All-Southwestern Athletic Conference (SWAC) recognition.[6] During a game against Southern on February 8, 2021, Jarrett walked off the court and threw his jersey on his way to the locker room after an argument with teammate Jayveous McKinnis.[7]
At the close of the regular season, Jarrett was named SWAC Player of the Year.[8] He averaged 21.1 points, 5.3 rebounds, and 1.4 steals per game. Following the season, Jarrett declared for the 2021 NBA draft.[9]