Keystone Academy in Chula Vista's eastern Otay Ranch district operates as a private Christian school at 2400 Fenton Street, combining independent-study and homeschool-hybrid instruction with SAT, ACT, and AP test preparation. Founded in 1986, the school files a single Private School Affidavit with the California Department of Education and pairs parent-directed curriculum selection with credentialed teacher oversight, a model that prepares graduates for post-secondary enrollment at institutions including Southwestern College on Otay Lakes Road. Each student's learning plan is tailored by the parent-teacher team, allowing flexible pacing through core A-G requirements alongside elective enrichment and field-trip programming. The Fenton Street location sits within the Otay Ranch commercial corridor near Otay Ranch Town Center, and families in the area supplement the independent-study model with structured physical education at community facilities including Aqua-Tots Swim School Otay Ranch. The school's test-preparation track covers College Board SAT subject benchmarks, ACT composite-score strategies, and Advanced Placement exam content across humanities and STEM disciplines, administered through individualized study schedules that adjust pacing based on quarterly diagnostic assessments.