Summary:
Glendora Unified has two high schools serving grades 9–12: a large comprehensive school and a much smaller continuation school. In 2025–2026, the two schools’ equal-school average was 41% proficient in ELA, 26% in math and 21% in science, below state results of 49%, 38% and 36%. The most important finding is that these figures mask sharply different school profiles, rather than describing a uniformly strong or weak group.
Glendora High stands out at the top: it had 67% proficiency in ELA, 52% in math and 38% in science, compared with 14%, 0% and 4% at Whitcomb Continuation High. The schools’ gaps were 53 percentage points in ELA, 52 in math and 34 in science. Glendora was above the state in all three subjects—by 18 points in ELA, 13 in math and 2 in science—while Whitcomb was below it by 35, 38 and 32 points. SchoolDigger ranked Glendora at the 76th statewide percentile with 4 stars, and Whitcomb at the 6th percentile with 0 stars.
Results declined at both schools from 2024–2025 to 2025–2026 in all three subjects, while state results rose; the equal-school averages fell by 3 points in ELA, 4 in math and 2 in science. Glendora’s SchoolDigger percentile also fell from 84 in 2024–2025 to 76, while Whitcomb’s declined from 14 to 6. Other differences may help parents understand each setting: Glendora enrolls 2,069 students, compared with 104 at Whitcomb, and has a student-teacher ratio of 24.1 versus 10.7. In 2024–2025, 21% of Glendora students and 44% of Whitcomb students were free/reduced lunch eligible. Whitcomb’s 93% graduation rate was above the state’s 88%, despite its lower test results; its chronic absenteeism was 64%, compared with 10% at Glendora.
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