Summary:
The two high schools in Charter Oak Unified serve grades 9–12: Charter Oak High (1,259 students) and Arrow High (Continuation) (71 students). Their 2025–26 results range from Charter Oak performing above the state in all-grades ELA and science to Arrow performing well below state levels in every subject. The central takeaway is that an area-wide average would conceal sharply different school-level outcomes.
Charter Oak High leads the two schools in all three 2025–26 all-grades subjects: proficiency was 56% in ELA, 28% in mathematics and 38% in science, compared with 5%, 11% and 5% at Arrow High (Continuation). The schools’ gaps were 50 points in ELA, 17 in mathematics and 33 in science. Charter Oak was 6 points above the state in ELA and 2 above in science, but 10 below in mathematics. Arrow was below the state by 44 points in ELA, 28 in mathematics and 31 in science. SchoolDigger gives Charter Oak 3 stars and a 62nd-percentile statewide ranking; Arrow has 1 star and ranks at the 14th percentile.
Recent changes are mixed, not a broad rise across subjects. From 2024–25 to 2025–26, Charter Oak’s science proficiency increased 12 points, while Arrow’s mathematics rose 7 points; Charter Oak’s ELA fell 5 points, and Arrow’s science fell 3. SchoolDigger’s percentiles also shifted over the three reported years: Charter Oak went from 63 to 59 to 62, while Arrow went from 11 to 9 to 14. In 2024–25, student-teacher ratios were 22 at Charter Oak and 13.3 at Arrow. Both report the same low-income measure, free/reduced lunch eligible, for 2024–25: 70% at Charter Oak and 86% at Arrow. Arrow’s 2025–26 graduation rate was 91%, above the state’s 88%, but its chronic absenteeism was 79%, compared with 18% statewide. These figures offer useful context, not an explanation for the schools’ differing results.
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