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Test scores

Lake Oswego High School · Lake Oswego, OR
See how it ranks: all Oregon schools by score · Clackamas County schools by score

OSAS, SY 2024-25

All grades, all students. % Proficient.
English Language Arts
84.5%
State avg 43.0%
District avg 74.9%
County avg 49.4%
+7.4pp since 2023-24
Mathematics
59.2%
State avg 31.8%
District avg 65.6%
County avg 38.1%
+5.0pp since 2023-24
Science
59.7%
State avg 30.2%
District avg 56.5%
County avg 34.8%
+11.8pp since 2023-24

What this means: On the OSAS, Oregon's statewide test, about 85 of every 100 students at this school read and write at grade level, about 59 of 100 do math at grade level, and about 60 of 100 are at grade level in science. Across all Oregon schools, those numbers are about 43, 32, and 30. Reading and writing scores are up about 7 points since 2023, while math scores are up about 5 points and science scores are up about 12 points.

BeatsExpectations

Demographically-adjusted score · methodology
Tier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
63.8%
composite math + reading, all grades
Predicted
57.0%
based on OR schools with similar FRL share
Beats by
+6.8pp
above demographic expectation

What this means: About 64% of students here test proficient in math and reading, compared with the roughly 57% typical for Oregon schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Oregon's top nor bottom 10%.

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 2024-25

School score vs state average per tested grade.
GradeEnglish Language ArtsMathematicsScience
SchoolStaten testedSchoolStaten testedSchoolStaten tested
Grade ALL84.5%43.0%29059.2%31.8%28759.7%30.2%278

2-year history

All grades, all students. Lake Oswego   Oregon avg

English Language Arts

42772023-2443852024-25
YearSchoolDistrictCountyState
SY 2024-2584.5%74.9%49.4%43.0%
SY 2023-2477.1%72.1%49.2%42.4%

Mathematics

31542023-2432592024-25
YearSchoolDistrictCountyState
SY 2024-2559.2%65.6%38.1%31.8%
SY 2023-2454.2%65.9%37.6%31.3%

Science

30482023-2430602024-25
YearSchoolDistrictCountyState
SY 2024-2559.7%56.5%34.8%30.2%
SY 2023-2447.9%53.0%33.3%29.6%

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How to read these scores

What is OSAS?
OSAS is the statewide standardized test administered by Oregon public schools.
What does "% Proficient" mean?
It is the share of students at the school who performed at grade level or above on the test, summed across the top two of four performance levels. A higher number is better.
What does 84.5% mean for English Language Arts at Lake Oswego High School?
It means about 84.5 percent of students tested at Lake Oswego High School performed at grade level or above on the OSAS English Language Arts test in 2024-25. The statewide average for Oregon that year was 43.0%. 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 Oregon, 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?
Oregon Department of Education, Oregon Statewide Assessment System (OSAS) — Smarter Balanced for ELA + Math, OAKS Science. School-level "Total Population (All Students)" subgroup, all grades combined, from the ODE Assessment Group Reports. Headline metric is the cumulative Level 3 + Level 4 rate (SBAC "Met or Exceeded Standard").
How often is it updated?
OSAS 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.

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