The Los Angeles County District Attorney's Office says girls from both campuses were victims. Prosecutors say three of them played on volleyball teams Silverio coached.
The molestations occurred between 1996 to 2007.
Silverio resigned as Firebaugh principal just prior to leaving for the Philippines in May 2009. He was arrested at the Los Angeles International Airport when he returned in July.
Compton Superior Court Judge John Cheroske ordered Silverio to undergo a 90-day evaluation by the state Department of Corrections and Rehabilitation.
Silverio is due back in court in September for sentencing. He faces up to eight years in state prison.
CNS contributed to this report.
Your feedback is important to us! Please complete a brief survey so we may continue to improve abc7.com