English Language Arts
6.5%
State avg 47.1%
District avg 8.6%
County avg 59.1%
-11.5pp since 2014-15
District avg 8.6%
County avg 59.1%
-11.5pp since 2014-15
Test scores
See how it ranks: all California schools by score · San Mateo County schools by score
CAASPP Smarter Balanced, SY 2023-24
All grades, all students. % met or exceeded standard.Math
8.3%
State avg 35.6%
District avg 6.1%
County avg 51.5%
-3.7pp since 2014-15
District avg 6.1%
County avg 51.5%
-3.7pp since 2014-15
What this means: On the CAASPP Smarter Balanced, California's statewide test, about 7 of every 100 students at this school read and write at grade level and about 8 of 100 do math at grade level. Across all California schools, those numbers are about 47 and 36. Reading and writing scores are down about 11 points since 2014, while math scores are down about 4 points.
BeatsExpectations
Demographically-adjusted score · methodologyTier
UNDERPERFORMING
Bottom 10% of CA schools after controlling for student poverty
Actual proficiency
7.3%
composite math + reading, all grades
Predicted
25.9%
based on CA schools with similar FRL share
Beats by
-18.5pp
below demographic expectation
What this means: About 7% of students here test proficient in math and reading, below the roughly 26% typical for California schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
By grade, SY 2023-24
School score vs state average per tested grade.| Grade | English Language Arts | Math | ||||
|---|---|---|---|---|---|---|
| School | State | n tested | School | State | n tested | |
| Grade 3 | 0.0% | 42.8% | 42 | 2.0% | 45.7% | 49 |
| Grade 4 | 13.6% | 44.0% | 44 | 18.9% | 41.3% | 53 |
| Grade 5 | 5.8% | 47.4% | 52 | 3.6% | 35.1% | 55 |
9-year history
All grades, all students. Costano California avgEnglish Language Arts
| Year | School | District | County | State |
|---|---|---|---|---|
| SY 2023-24 | 6.5% | 8.6% | 59.1% | 47.1% |
| SY 2022-23 | 11.1% | 10.9% | 59.3% | 46.7% |
| SY 2021-22 | 13.6% | 12.3% | 60.0% | 47.1% |
| SY 2020-21 | N/A | N/A | 61.9% | 49.0% |
| SY 2018-19 | 22.2% | 17.4% | 62.8% | 51.1% |
| SY 2017-18 | 26.4% | 25.3% | 62.3% | 49.9% |
| SY 2016-17 | 18.4% | 20.9% | 61.4% | 48.6% |
| SY 2015-16 | 18.0% | 18.9% | 61.1% | 48.1% |
| SY 2014-15 | 18.0% | 14.9% | 58.2% | 44.0% |
Math
| Year | School | District | County | State |
|---|---|---|---|---|
| SY 2023-24 | 8.3% | 6.1% | 51.5% | 35.6% |
| SY 2022-23 | 3.6% | 4.8% | 51.4% | 34.6% |
| SY 2021-22 | 2.8% | 5.6% | 50.6% | 33.4% |
| SY 2020-21 | N/A | N/A | 53.6% | 33.7% |
| SY 2018-19 | 16.0% | 10.3% | 54.8% | 39.8% |
| SY 2017-18 | 12.1% | 14.6% | 54.7% | 38.7% |
| SY 2016-17 | 7.1% | 11.9% | 54.0% | 37.6% |
| SY 2015-16 | 8.0% | 10.5% | 53.3% | 36.7% |
| SY 2014-15 | 12.0% | 10.3% | 50.8% | 33.6% |
How to read these scores
What is CAASPP Smarter Balanced?
CAASPP (the California Assessment of Student Performance and Progress) is California's annual statewide test. Public-school students in grades 3 through 8 and grade 11 take the Smarter Balanced Summative Assessments in English Language Arts and Math each spring.
What does "% met or exceeded standard" mean?
It is the percentage of students at the school whose scores were rated "Standard Met" or "Standard Exceeded" on the test. Those are the top two of four performance levels, and they signal the student is performing at grade level or above. A higher number is better.
What does 6.5% mean for English Language Arts at Costano Elementary?
It means about 6.5 percent of students tested at Costano Elementary performed at grade level or above on the CAASPP Smarter Balanced English Language Arts test in 2023-24. The statewide average for California that year was 47.1%. The other students fell into the lower performance levels.
How is the state average calculated?
It is a weighted average, not a simple average of each school's number. We multiply each public school's score by how many of its students tested, add those together for all schools in California, and divide by the total students tested that year. This way a big school with 1,500 students counts more than a small school with 50 students, which is the right way to ask "how did the typical student do this year?". District and county averages on this page use the same method, just scoped to that district or county.
Where does this data come from?
California Department of Education, CAASPP Smarter Balanced Summative Assessment. School-level "All Students" subgroup. Scores suppressed for groups under 11 students.
How often is it updated?
CAASPP Smarter Balanced is administered once a year (spring). Results are released by the state in the summer or early fall. We refresh this page after each annual release.