Summary
Castro Valley High is a public high school in Castro Valley, California, serving grades 9–12 in an East Bay community, with 2,874 students. It pairs strong completion outcomes—a 98% graduation rate in 2025–2026—with test results that are high by state standards. The key finding is that it leads nearby schools in all three reported all-grades test subjects, although its scores are below its district’s averages in every subject.
Among nine nearby schools with reported scores, Castro Valley High led in English language arts (ELA), math, and science, scoring 60%, 43%, and 49%. The next-highest nearby scores were 51% at Hayward High in ELA, and 27% in math and 34% in science at Arroyo High; the school’s leads were 9, 16, and 16 percentage points. Its scores were 11 points above California’s in ELA, 4 points above in math, and 13 points above in science. But compared with Castro Valley Unified, it was 6 points lower in ELA, 16 lower in math, and 2 lower in science. Graduation is another strength: the rate was 98%, versus 97% for the district and 88% statewide; only nearby East Bay Arts High had a higher reported rate. Attendance is less favorable against the district: chronic absenteeism was 14%, compared with 12% districtwide, though below the state’s 18%.
Test results have fallen since 2022–2023: ELA declined 12 points, math 10, and science 3, while state results rose. As a result, the school’s lead over the state narrowed by 14 points in ELA, 13 in math, and 9 in science. SchoolDigger still ranks it in the 82nd statewide percentile with 4 stars, down from the 92nd percentile and 5 stars in 2022–2023; it remains ahead of nearby schools with rank histories, with Arroyo High next at the 53rd percentile. SchoolDigger’s ranking for how well it serves Special Education Students was at the 42nd percentile, versus 82nd overall, and had fallen from the 86th percentile in 2023–2024. Its ranking for how well it serves Hispanic Students was at the 54th percentile. The 2024–2025 free/reduced lunch eligible rate was 40%; the supplied data identifies California as a statewide-free-meals state. The student-teacher ratio was 23.5, second-highest among four nearby comprehensive high schools with reported ratios, whose average was 21.5.
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