Summary:
ZIP code 93063 has two public high schools, both serving grades 9–12 in Simi Valley Unified. Their 2025–2026 all-grades results average 70% in English language arts (ELA), 43% in math and 53% in science, above state rates of 49%, 38% and 36%, respectively, but those area averages mask a substantial divide between the schools. The most important finding is that Santa Susana High outscored Simi Valley High in every subject, by 24 points in ELA, 17 in math and 30 in science.
Santa Susana High stands out across the board, with 82% proficiency in ELA, 51% in math and 68% in science; it exceeded state results by 33, 13 and 32 points, respectively. Simi Valley High scored 57% in ELA and 38% in science, both above the state, but its 34% in all-grades math was 4 points below the state’s 38%. Santa Susana also reported a 97% graduation rate, compared with 94% at Simi Valley and 88% statewide. Its dropout rate was 1% and chronic absenteeism 13%, versus 2% and 16% at Simi Valley.
Results are changing differently at the two schools: from 2024–2025 to 2025–2026, Simi Valley gained 6 points in ELA, 13 in math and 6 in science, while Santa Susana gained 1 in ELA and 7 in science but lost 7 in math. In 11th-grade math, Simi Valley was 3 points above the state, a more favorable comparison than its all-grades result. SchoolDigger ranks Santa Susana in the 93rd statewide percentile with five stars, versus Simi Valley in the 67th percentile with three stars; Simi Valley’s percentile rose from 58 in 2023–2024. Santa Susana is also smaller, with 1,033 students and a 20.3 student-teacher ratio, compared with 1,910 students and 24.1 at Simi Valley. For 2024–2025, free/reduced lunch eligible students made up 31% at Santa Susana and 37% at Simi Valley; these figures provide context, not an explanation for school results.
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