Summary:
Fullerton Joint Union High includes eight high schools serving grades 9–12: six comprehensive schools, La Vista High (Continuation), and La Sierra High (Alternative). In 2025–2026, the seven schools with reported English language arts (ELA) results averaged 59%, compared with 49% statewide; their math average was 40%, close to the state’s 38%. But those averages conceal wide differences: the highest-to-lowest school gaps were 75 points in ELA, 67 in math, and 69 in science. The most important takeaway is that results vary sharply by school, so the area-wide average alone is a poor guide to what families will find.
Troy High leads all three subjects, with 86% in ELA, 76% in math, and 75% in science—36, 37, and 39 points above the state, respectively. Sonora High also stands out, ranking second in ELA and math and third in science. At the other end, La Vista has the lowest reported results: 11% in ELA, 9% in math, and 6% in science. It also reports a 74% graduation rate, 78% chronic absenteeism, and a 22% dropout rate. La Sierra’s 67% science proficiency is second to Troy’s, but its ELA and math results are suppressed; its alternative setting also makes direct comparisons less straightforward.
Results improved on average from 2024–2025 to 2025–2026 among the seven schools with both years reported: ELA rose about 1 point and math about 2 points. Sonora, Buena Park High, and La Habra High improved in all three subjects, while Sunny Hills High and Fullerton Union High declined in all three. SchoolDigger ranked Troy in the 98th percentile and La Vista in the 14th; Sonora’s ranking rose from the 82nd to the 86th percentile, while Fullerton Union’s fell from the 76th to the 64th. All eight schools report a free/reduced lunch-eligible share for 2024–2025: Troy’s was 40%, compared with 91% at Buena Park and 67% at Sonora, whose strong results show that these figures do not neatly sort schools by performance.
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