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Email BoardHillsdale High
3115 Del Monte Street, San Mateo, CA 94403-3800
Summary
Reading and math results average to the 79th percentile among comparable California schools.
67.7% of students met California's reading standard, and it is trending up slightly.
Math is weaker: 43.4% of students met California's math standard, but it is trending up.
Proficiency stats
| Current Reading Proficiency | 67.7% |
| Current Math Proficiency | 43.4% |
| Reading State Rank | 380/1,596 (76th percentile) |
| Math State Rank | 282/1,596 (82nd percentile) |
School information
| Student / Teacher Ratio | 19:1 |
| Student enrollment (2024–25) | 1,585 |
| Low-Income Students | 412 (26.0%) |
| English Learners | 208 (13.1%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 4.4 points from last year and rose 2.7 points over the full period. Math rose 1.5 points from last year and rose 6.1 points over the full period.
•Math +6.1 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Asian and White students have the strongest results.
Distribution of Scores by Grade
67.6% of tested students meet the reading standard in the grade shown. Overall, the school’s reading results rank in the top 24% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 36.5-point reading income gap is wider than the 14.7-point gap at a typical California 9–12 school. It narrowed over the period shown.
•English Learners vs English Native
0.0% of English learners meet the reading standard, compared with 81.4% of English-only students. The gap widened as English-learner results held steady and English-only results rose.
Math Proficiency Scores
2026 state test results
Race and Ethnicity
Asian students have the strongest math results at about 84% proficiency. The other reported groups range from about 17% to 51%.
Distribution of Scores by Grade
43.4% of tested students meet the math standard in the grade shown. Overall, the school’s math results rank in the top 18% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 23.7-point math income gap is wider than the 14.2-point gap at a typical California 9–12 school. It narrowed over the period shown.
•English Learners vs English Native
English-learner math proficiency held steady at 0.0%, while English-only results rose. The gap widened.
How we compare income gaps
“Typical” means the median gap across 876 schools for reading and 882 for math. The comparison uses 2026 California 9–12 schools with at least 20 tested students in each income group and a reported low-income student population. Each school counts once. Its gap is non-low-income proficiency minus low-income proficiency, including negative gaps. California state test data
Understanding this school
How does Hillsdale High compare within the district?
Hillsdale High is No. 5 in reading and No. 6 in math proficiency among the 7 9–12 schools in San Mateo Union High with 2026 results.
Explore the district’s schoolsHow does Hillsdale High rank in California?
Hillsdale High ranks No. 380 of 1,596 in reading and No. 282 of 1,596 in math for 2026. These proficiency rankings compare California schools in the same grade-level category.
How do low-income students at Hillsdale High compare within the district?
Low-income students here rank No. 4 in both subjects among 6 9–12 district schools with reportable 2026 results for this group. 42.3% meet the reading standard and 26.9% meet the math standard.
See results by student groupHow does Hillsdale High compare with other schools in San Mateo?
Hillsdale High is No. 2 in reading and No. 3 in math proficiency among the 3 9–12 schools in San Mateo with 2026 results.
Explore schools in San MateoHow does Hillsdale High compare with other schools in San Mateo County?
Hillsdale High is No. 9 in both reading and math proficiency among the 25 9–12 schools in San Mateo County with 2026 results.
Explore schools in San Mateo CountyWhich schools should I compare?
Schools serving 9–12 in the same district.
| School | Math | Reading |
|---|---|---|
| Hillsdale HighThis school | 43.4% | 67.7% |
| Aragon High | 65.0% | 81.4% |
| San Mateo High | 47.8% | 62.1% |
