Prior to arriving at UCLA, Ajoc was a four-year varsity letter winner in tennis at Richard Gahr High School in Cerritos, Calif. under the direction of head coach David Thompson. He was a four-time San Gabriel Valley League Doubles Champion, serving as team captain his senior year. Ajoc qualified for the CIF-SS Individual Doubles Championships his junior and senior years. He graduated as Scholar Athlete of the Year in 2011. Outside of high school competition, he trained under former Filipino No. 1 Joseph Lizardo at the Lizardo Tennis Academy in Cerritos.
Ajoc admires pro boxer Manny Pacquiao, former UCLA Bruin Reggie Miller, and NFL wide receiver Demariyus Thomas. He is majoring in Biology at UCLA and plans to pursue a career in Pharmacy after graduating.