Summary:
ZIP code 92392 has 10 schools: 2 elementary, 2 middle and 6 high schools. Their results vary widely, from a clear academic leader to schools with very low proficiency, and the group’s average trails California in all three subjects. Across the schools, average proficiency is 43% in English language arts (ELA), 23% in math and 28% in science, compared with 49%, 38% and 36% statewide. Math is the largest overall gap: the school average is 16 percentage points below the state. The most important finding is that these schools are uneven, not uniformly strong or weak.
University Preparatory stands out at the top, with 89% proficiency in ELA, 68% in math and 78% in science; it is the only school with a SchoolDigger five-star rating and ranks in the 98th percentile. Cobalt Institute of Math and Science is second in all three subjects, at 73%, 43% and 47%, and ranks in the 87th percentile. At the other end, Mesa Linda Middle is lowest in every subject—15% in ELA, 5% in math and 6% in science—and ranks in the 2nd percentile. Its results are 34, 34 and 30 points below state figures, respectively.
Recent changes are mixed: the average gap with the state narrowed by 1 point in ELA and science but widened by 2 points in math from 2024–25 to 2025–26. Excelsior Charter School Corona-Norco had especially large gains—11 points in ELA and 14 in science—though its math proficiency is 21%; it has 133 students. Adelanto High offers a different subject profile: ELA is 4 points above the state, while math is 27 points below. Size and other reported measures do not neatly track achievement: University Preparatory has the highest student-teacher ratio, 26.1, and 75% of students were free/reduced lunch eligible in 2024–25, compared with 16.2 and 51% at Corona-Norco. These are observations, not explanations for results.
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