Cornerstone Christian School (Camarillo, California)  Cornerstone Christian School is a private Christian school in Camarillo, California. The school covers grades Preschool to 8th. It was established in 1981 and covered high school grades for 30 years until 2011, when the final four grades were eliminated due to falling enrollment (as class sizes increased). The school fielded small athletic teams that participated in the Condor League. The school has been accredited by the Association of Christian Schools International and the Western Association of Schools and Colleges.