Summary:
Castro Valley Unified has three high schools serving grades 9–12, with 2,984 students combined; their reported results vary substantially. In 2025–2026, Castro Valley High was above state proficiency rates in ELA, math, and science, while Redwood Continuation High was below the state in all three. The most important takeaway is that the school a student attends makes a marked difference in reported results: Castro Valley led Redwood by 40 percentage points in ELA, 40 points in math, and 41 points in science.
Castro Valley High stands out at the top for academics and graduation: 60% were proficient in ELA, 43% in math, and 49% in science, compared with 21%, 3%, and 8% at Redwood; Castro Valley’s graduation rate was 98%, versus 80% at Redwood and 88% statewide. Castro Valley also had lower chronic absenteeism and dropout rates than Redwood: 14% versus 81% absenteeism, and 1% versus 15% dropout. Roy A. Johnson High reported 43% chronic absenteeism. Roy A. Johnson has no test scores, graduation rate, or dropout rate reported in the supplied data.
Results changed unevenly: from 2024–2025 to 2025–2026, Castro Valley’s ELA and math scores fell by 8 and 7 points, while science rose by 1 point; Redwood improved by 11 points in ELA and 5 in science but fell by 4 in math. SchoolDigger ranks Castro Valley 393rd of 2,137 schools, in the 82nd percentile with 4 stars, and Redwood 1,815th, in the 15th percentile with 1 star. As context, 2024–2025 free/reduced lunch eligible shares were 40% at Castro Valley, 78% at Redwood, and 50% at Roy A. Johnson; student-teacher ratios were 23.5, 12.4, and 9.0, respectively. These differences describe the schools’ profiles but do not explain their outcomes.
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