Menor spent high school at San Beda College in Mendiola, Manila where he was a vital cog for the Red Cubs in the NCAA Juniors Division. They swept the eliminations of the 79th season of the NCAA paving the way for a duel with the Mapua Robins for the 2003 Juniors basketball championship. The Red Cubs won and Menor was named the Finals MVP. During the 80th season which was his last in the NCAA Juniors, Menor was named the Season MVP and Finals MVP while beating the Letran Squires for the championship.
College
Menor figured in a controversy even before his first college game. He stayed at La Salle for a week before he had a change in heart and opted to return to San Beda College. There, he boldly promised to give the Red Lions the championship. In his first year, though, he struggled to adapt to the college game. Still, he was a threat to other teams. He lost the Rookie of the Year honors to Kelvin dela Peña. San Beda had high hopes of winning the championship after a 28-year drought during his second year. With Menor contributing consistently with averages of 8.6 points, 6 rebounds, and 1.9 assists in 14 games, he finally delivered on his promise as they won the NCAA championship against the PCU Dolphins. In his third year, the Red Lions faced the Letran Knights for the championship and Menor was named the Finals MVP. Menor scored a career high 35 points against the St. Benilde Blazers during his senior year. That was his last year in the Red Lion uniform as he opted to enter his name in the PBA after the season ended.
