Kamari Ramsey attended Sierra Canyon School located in Los Angeles, California where he was ranked the No. 10 safety in the nation by ESPN and No. 14 by 247Sports. He was named a 2022 Polynesian Bowl All-Star and was rated a four-star recruit as a high school senior. After initially committing to the University of Stanford, Ramsey flipped his commitment to play for the UCLA Bruins.
During Ramsey's first collegiate season in 2022, he used the season to redshirt, playing in just four games totaling six tackles. In the 2023 season, Ramsey notched 40 tackles with 2.5 being for a loss, five pass deflections, and an interception, while allowing just eleven receptions.
After the conclusion of the 2023 season, Ramsey decided to enter his name into the NCAA transfer portal, and decided to transfer to USC.