High Schools in Manteca Unified

Manteca Unified has eight high schools: seven serve grades 9–12, while Yosemite School Community Day serves grades 7–12. In 2025–26, the schools’ unweighted average proficiency was 36% in English language arts (ELA), 15% in math and 20% in science, compared with state results of 49%, 38% and 36%. Math is the largest area of concern relative to the state, but the most important finding is how widely results vary from school to school.

Sierra High stands out as the clear leader, with 68% proficient in ELA, 41% in math and 48% in science—the highest results in the group and above the state in all three subjects. Its lead over the next-highest school is 12 percentage points in ELA, 16 in math and 16 in science. Lathrop High is second in ELA at 56%, while Manteca High is second in math at 25%; both are well behind Sierra in the other subjects. At the lower end, Yosemite has the lowest ELA result at 5%, and New Vision High reports 0% in math and science. Calla High is also low across subjects.

Recent results show a broad ELA decline: the average fell 7 percentage points from 2024–25 to 2025–26, and seven of eight schools’ ELA results dropped. Math rose by less than a point, while science fell by 1 point among the seven schools with results in both years; the state improved in all three subjects. SchoolDigger’s latest percentile rankings place Sierra at 80 and New Vision at 1, while rankings also fell for several schools, including Lathrop (73 to 54) and East Union (47 to 34). Context does not sort schools neatly by results: Lathrop and East Union High have similar enrollment and each had 62% of students free/reduced lunch eligible in 2024–25, yet Lathrop scored higher by 10 points in ELA, 9 in math and 12 in science. Sierra’s student-teacher ratio was 22.6 in 2024–25, higher than the ratios at Calla and New Vision, despite Sierra’s much stronger proficiency. Yosemite serves a different grade span, and results at the smallest schools may be more sensitive to small student numbers.