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Chaffey Joint Union High

Los Osos High

6001 Milliken Avenue, Rancho Cucamonga, CA 91737-7709

Summary

Los Osos High is a good school.

79.0% of students are reading at grade level in Los Osos High, and it is holding steady.

Math is weaker at 50.9%, and it is trending down slightly.Trending down

Proficiency Stats
Current Reading Proficiency79.0%
Current Math Proficiency50.9%
Reading State Rank139/1609 (91st percentile)
Math State Rank170/1605 (89th percentile)
Other Stats
Student / Teacher Ratio26:1
Student Enrollment2,759
Low-Income Students1,221 (44.3%)
English Learners84 (3.0%)
Quick links
School WebsiteGreat SchoolsNicheEd-DataCAASPP
2-Year Trends
2023 - 2025
Reading +0.2%Trend up•Math -0.5%Trend down
Showing school-level proficiency for the last three years

Reading Proficiency Scores

Race, economic status, English learner status, and distribution of scores by grade.

Race and Ethnicity
Distribution of Scores by Grade
Low-Income vs Non-Low-Income
Low-Income
Non-Low-Income
Low-Income +3.7%Trend up•
Non-Low-Income -0.4%Trend down
Showing subgroup proficiency for the last three years
English Learners vs English Native
English Learners
English Native
English Learners +8.3%Trend up•
English Native -1.5%Trend down
Showing subgroup proficiency for the last three years

Math Proficiency Scores

Race, economic status, English learner status, and distribution of scores by grade.

Race and Ethnicity
Distribution of Scores by Grade
Low-Income vs Non-Low-Income
Low-Income
Non-Low-Income
Low-Income -2.2%Trend down•
Non-Low-Income +2.5%Trend up
Showing subgroup proficiency for the last three years
English Learners vs English Native
English Learners
English Native
English Learners +11.7%Trend up•
English Native -2.5%Trend down
Showing subgroup proficiency for the last three years
Markdown Version