Math
32%Grade 11 · Proficient or Advanced
Charter high school
River Islands High
No single number tells this school's story. Here's the honest picture.
53% of tested students are Proficient or Advanced in English and 32% in math. Explore the evidence alongside the opportunities your child would use.
SchoolScope archetype
Building Momentum
What this means for your family
This label means the data doesn't clearly sort the school one way or the other — ask what the school is proud of, and what it's working on.
How archetypes are assigned →Data sources · Methodology · State tests: 2025
Contact
English
53%Grade 11 · Proficient or Advanced
Students
512Total enrollment
Graduation
—Four-year graduation rate
What are you trying to decide?
The overall score is a starting point.
Look at subject results, trends and student groups, then consider the opportunities your child would use.
View school performance →Start with your child’s daily experience.
Explore teaching, coursework and student-group results. A schoolwide average cannot predict an individual experience.
Explore student experience →Confirm the enrollment route.
Check the address, grade and enrollment requirements directly with the district or school.
Check attendance and enrollment →Compare the options you can access.
Use comparable evidence alongside entry requirements, cost and location.
Compare nearby schools →Academic performance
What do the results tell us?
2025 results · Grade 11 · weighted by students tested within each subject.
Proficient or Advanced combines Levels 3 and 4, formerly Standard Met and Standard Exceeded. California changed the names for 2025–26; the cut scores did not. About the labels →
Share at Proficient or Advanced
● Math┄ English
Gaps in the lines mark years without annual results.
Exact annual results
| Year | Math | English |
|---|---|---|
| 2025 | 32% | 53% |
Each year describes that year’s tested students. Changes between years do not follow the same children over time. Cohort-growth evidence, when available, is labeled separately below.
How achievement is distributed
AdvancedStandard Exceeded
13%ProficientStandard Met
19%DevelopingStandard Nearly Met
25%MinimalStandard Not Met
43%AdvancedStandard Exceeded
18%ProficientStandard Met
34%DevelopingStandard Nearly Met
29%MinimalStandard Not Met
18%Achievement-level percentages are not percentiles. “Developing” here is a test achievement level, separate from the SchoolScope performance band with the same name.
Annual results and the full academic record
Where students land · CAASPP 2024–25
Two in five of students here meet the standard. One in ten clear it by a lot.
ELA53% met or exceeded
Exceeded 18%Met 34%Nearly Met 29%Not Met 18%
Math32% met or exceeded
Exceeded 13%Met 19%Nearly Met 25%Not Met 43%
Exceeded Met Nearly Met Not Met
California high schools · average20% exceeded · 43% met or exceeded
This school against the California average
2025–2025 trend · CDE CAASPP
| Scope | % Exceeded | % Met+ | Grad rate | College readiness | Absence | Suspension | |
|---|---|---|---|---|---|---|---|
| This school | 48 | 16% | 42% | — | — | 16.1% | 6.5% |
| CA average · High School | 54 | 20% | 43% | 92.5% | 43.0% | 23.1% | 3.3% |
This schoolCA avg
Scope4854
% Exceeded16%20%
% Met+42%43%
Grad rate—92.5%
College readiness—43.0%
Absence16.1%23.1%
Suspension6.5%3.3%
Students & opportunity
Who shares in the school’s results?
Who it works for · CAASPP 2024–25
Low-income students here meet the ELA standard ahead of the same group statewide.
At River Islands High in Lathrop, 46.0% of low-income students met or exceeded the ELA standard in 2025, compared to 26.5% district-wide and 38.2% statewide. River Islands High outperforms its district average for low-income students by 19.5 percentage points in ELA. Other subgroups: Low-Income students (25.5% Math proficient); Asian students (56.8% ELA proficient). The largest proficiency gap is 33.9 percentage points for disabilities students. Data source: California Department of Education, CAASPP 2024-25. 50 students tested.
Met or exceeded · reading and math combined
All students at this school: 42% met or exceeded
All StudentsAll Students: this school 42%, district —, state 43%42%
MaleMale: this school 42%, district 8%, state 42%42% · −0 vs school
FemaleFemale: this school 43%, district —, state 44%43% · +1 vs school
Socioeconomically DisadvantagedSocioeconomically Disadvantaged: this school 36%, district 20%, state 32%36% · −7 vs school
AsianAsian: this school 51%, district —, state 72%51% · +9 vs school
Hispanic/LatinoHispanic/Latino: this school 27%, district 17%, state 32%27% · −15 vs school
FilipinoFilipino: this school 53%, district —, state 65%53% · +11 vs school
Students with DisabilitiesStudents with Disabilities: this school 13%, district 0%, state 15%13% · −30 vs school
WhiteWhite: this school 46%, district —, state 56%46% · +4 vs school
Black/African AmericanBlack/African American: this school 29%, district —, state 26%29% · −13 vs school
English LearnersEnglish Learners: this school 9%, district 18%, state 11%9% · −33 vs school
American Indian/Alaska NativeAmerican Indian/Alaska Native: too few students to report‹11
Pacific IslanderPacific Islander: too few students to report‹11
Two or More RacesTwo or More Races: too few students to report‹11
this school district, same group California, same group
ShowHide California's growth model by student group
No student-group growth record is available for this school in this data release.
Where graduates go
What happens after high school?
See the published graduate records below. Missing destination counts are not treated as zero.
College destinations and the full graduate record
Where graduates go
Context — never part of the Scope Score
The daily experience
What is it like to be a student here?
Students per teacher
Student–teacher ratio is a schoolwide staffing measure, not an average class size.
Teacher experience
Average teacher experience in the published staffing record. It does not measure individual teacher effectiveness.
AP subjects authorized
Authorization does not mean every course runs every year. Ask about current offerings, prerequisites, scheduling and support.
Chronically absent
The share of students absent for at least 10% of their enrolled school days. Attendance reflects both school and out-of-school circumstances.
The people teaching · CDE staffing 2024–25
About 19 students for every teacher here.
Context — never part of the Scope Score
River Islands's teachers are authorized to teach 15 of the 40 AP subjects the College Board offers — above the 14-subject median among California schools that offer AP at all — including Calculus BC, Calculus AB, and Physics 1.
Students per teacher19 · district 24
Teaching staff32 teachers
Avg. experience7.5 years
First-year teachers13%
PrincipalCarey Simoni
ShowHide what the district pays
Teacher salary schedule$59,858 – $115,707
Superintendent salary$216,665
Pay is set by the district, not the school.
Advanced coursework
AP subjects taught15
ShowHide the 15 AP courses by discipline
Math & Computer Science (4)Calculus AB · Calculus BC · Computer Science A · Computer Science Principles
Sciences (3)Biology · Chemistry · Physics 1
English (2)English Language and Composition · English Literature and Composition
History & Social Science (5)Macroeconomics · Psychology · U.S. Government and Politics · United States History · World History: Modern
World Languages & Cultures (1)Spanish Language and Culture
Data source: College Board AP Course Audit, 2025 - 2026 audit year (authorization, not enrollment) · IB World Schools directory, name-matched
Attendance & discipline · 2024–25
Kids here show up more, and get suspended more, than the state average.
Chronic absenteeismChronic absenteeism: this school 16.1%, district 18.9%, state 23.1%16.1% · −7.0pp vs state
Suspension rateSuspension rate: this school 6.5%, district —, state 3.3%6.5% · +3.2pp vs state
This schoolDistrictCalifornia
Resources & neighborhood
What sits behind the school experience?
The neighborhood · ACS 2024
One in three of students here qualify for free or reduced lunch, versus three in five statewide.
Context — never part of the Scope Score
Worth knowing
At 512 students, this school is much smaller than the typical California high school (≈1450).
On the state's science test (CAST), 24% met or exceeded the standard — science is tested in grades 5 and 8 and once in high school, and it never enters the Scope Score.
Hispanic or Latino29.9% · district 28.7% · CA 56.1%
White8.0% · district 8.7% · CA 19.9%
Asian29.3% · district 36.3% · CA 10.2%
Black10.9% · district 9.2% · CA 4.8%
Other21.9% · district 17.1% · CA 9.0%
Free or reduced lunch37.9% · CA 64%
Median income$125K · CA $85K
Median home value$643K · CA $659K
Bachelor's degree+28% · CA 35%
ZIP population35,395
Median age34 years
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2024) · ZIP-level
Culture & philosophy
What is the school’s approach?
School-stated approach · questions for your visit
Look beyond the brochure
A source-reviewed culture summary is not available for this profile yet. Ask how teaching, student support and family communication work day to day.
Read the school’s own website ↗Family voices
What would you want another family to know about the daily experience here?
Ask a current family: “When your child needs help, how does the school respond?”
Educator voices
What should families understand about teaching, support and the school community?
Ask an educator: “How do you adapt a typical day for children with different needs?”
Compare nearby schools
What are the alternatives?
Compare schools serving the same grade stage. Private schools have no comparable state-test score.
2025 · high schools · combined reading and math measures. Percentiles compare schools within their enrollment group.
No nearby schools in this category are listed. The school being viewed stays visible for reference.
| School | Type | Performance band | Advanced | Proficient or Advanced | Distance | Select |
|---|---|---|---|---|---|---|
| River Islands High | Charter | Developing | 16% | 42% | School being viewed | |
| Sierra High | Public | Solid | 24% | 52% | 2.7 mi | |
| Lathrop High | Public | Developing | 14% | 41% | 1.5 mi |
More nearby public and private options
Your other options
Your other options
Nearby public schools across grade levels, plus private options within 10 miles.
Private schools do not receive a Scope Score or statewide ranking on SchoolScope.
1 private school within 10 miles
Not scored
What should I check before applying?
- District public
- Confirm the attendance boundary and any permit options.
- Charter
- Check applications, priorities and deadlines with each school.
- Private
- Confirm admission requirements, tuition and financial aid.
Moving & enrollment
Which schools could serve my child?
Check enrollment with this charter school
Ask the school about applications, priorities and deadlines for your child’s grade.
School website →Schools across the K–12 journey
Elementary · K–5
Middle · 6–8
No school established for this stage.
High school · 9–12
Schools are grouped by grade stage. Nearby schools are not confirmed feeder links or address assignments. Verify the current path and eligibility with the district.
Charter enrollment details
Plan your next step
What should I do next?
Worth a school visit
Ask what the school is working on next. Strong numbers tell you where a school is, not where it's going.
- Ask whether the tour can step into a working classroom — watch how the teacher handles a student who's stuck.
- Ask to tour while school's in session, and notice how hallways and transitions feel — culture shows up between classes, not just in them.
- Ask how the school communicates with families when a child starts to struggle.
- Ask what a typical day looks like for a new student in the first few weeks.
Questions
Frequently asked questions
Is River Islands High a good high school?
River Islands High has a Scope Score of 48 out of 100, placing it in the 35th percentile of California high schools and ranked #1,074 statewide. 15.6% of students exceeded the state standard on the 2025 CAASPP assessment, which is 4.2 percentage points below the California average of 19.8%. The Scope Score weights 7 dimensions for high schools: graduation rate (25%), exceeded standard (22%), college/career readiness (20%), met or exceeded (proficient) (18%), chronic absenteeism (5%), suspension rate (5%), and ELPAC English Learner proficiency (5%). Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.
What are River Islands High's CAASPP test scores?
On the 2025 CAASPP Smarter Balanced Assessment, 42.3% of students at River Islands High met or exceeded the state standard in ELA and Math combined, and 15.6% exceeded it. The gap between those numbers matters: 26.6% of students are at the proficiency floor, while 15.6% went beyond it. Most rating sites report only the combined "proficient" number. SchoolScope surfaces the exceeded-vs-met split because it shows how many students go beyond the standard rather than only meeting it. 263 student-subject combinations were assessed.
How does River Islands High rank in California?
River Islands High ranks #1,074 among California high schools by Scope Score, placing it in the 35th percentile. This ranking is based on a weighted composite of 2025 CAASPP test performance (exceeded and met rates), chronic absenteeism, and suspension rate. Unlike single-number ratings, the Scope Score shows what drives the ranking so parents can decide what matters most to their family. See full methodology.
What is the attendance and school culture like at River Islands High?
16.1% of students at River Islands High are chronically absent (missing 10% or more of school days), which is better than the California average of 23.1%. The suspension rate is 6.5%. SchoolScope includes these culture metrics in the Scope Score because they reflect day-to-day school experience in ways test scores alone cannot.
How does River Islands High compare to other schools in Lathrop?
River Islands High scores 48/100 (35th percentile) among California high schools. To compare with nearby schools, SchoolScope shows the same metrics side by side: exceeded rate, proficiency, growth trajectory, and school culture indicators. The school serves 512 students. Use the schools in Lathrop page or the map view to compare all high schools nearby.
How does River Islands High serve low-income and underrepresented students?
At River Islands High in Lathrop, 46.0% of low-income students met or exceeded the ELA standard in 2025, compared to 26.5% district-wide and 38.2% statewide. River Islands High outperforms its district average for low-income students by 19.5 percentage points in ELA. Other subgroups: Low-Income students (25.5% Math proficient); Asian students (56.8% ELA proficient). The largest proficiency gap is 33.9 percentage points for disabilities students. Data source: California Department of Education, CAASPP 2024-25. 50 students tested. SchoolScope shows disaggregated test scores by demographic subgroup so you can see how a school performs for your child's specific group — not just the school-wide average. Subgroup data is context, not part of the Scope Score: we don't penalize schools for who they serve. See our equity approach.
What AP courses are offered at River Islands High?
River Islands High's teachers are authorized to teach 15 of the 40 AP subjects the College Board offers, per the 2025 - 2026 AP Course Audit: Biology, Calculus AB, Calculus BC, Chemistry, Computer Science A, Computer Science Principles, English Language and Composition, English Literature and Composition, Macroeconomics, Physics 1, Psychology, Spanish Language and Culture, U.S. Government and Politics, United States History, World History: Modern. Authorization means the school may teach a course, not that a section is running this year, and it's separate from AP exam pass rates. Data source: College Board AP Course Audit, analyzed by SchoolScope.
A low score doesn't tell the whole story. Read: Your School Scored Low — Here's What That Actually Means
Use the published evidence to prepare questions, then verify fit and access with the school.
Behind the evidence
Inspect the full record
Public sources, visible methods and the underlying school record. Source years and limitations stay attached to the evidence.
How the Scope Score is calculated
On a narrow screen, scroll the table sideways to see the state comparison and weights.
What the score weighs · CAASPP 2024–25
The 4 things our score weighs
| What we weigh | Here | State | Weight |
|---|---|---|---|
| Exceeded standard | 15.6% | 19.8% | 22% |
| Met or exceeded | 42.3% | 43.2% | 18% |
| Chronic absenteeism | 16.1% | 23.1% | 5% |
| Suspension rate | 6.5% | 3.3% | 5% |
Source CAASPP 2025 · California Department of Education. Measures graduation, test performance, college readiness, attendance, and climate — not arts, community, or your kid. How the score is built
A closer look at the evidence
River Islands High: reading the evidence
River Islands posts 42% meeting the standard and 15.6% exceeding it, against 43% and 19.8% statewide. The gaps and the bright spots below are the real read.
Subject proficiency describes tested students, while graduation describes a graduating cohort. These figures are not successive stages followed by the same students.
This label means the data doesn't clearly sort the school one way or the other — ask what the school is proud of, and what it's working on.
Explore the underlying data →Every number: score factors, grades, student groups and downloads
Every number · For the data nerds
Every number on this page
Score factors, grade-level breakdowns, subgroup proficiency, and nearest schools.
River Islands High is ranked #1,074 statewide.
01Score factorsWeighted composite · 2024–25
| Factor | School | State | Weight |
|---|---|---|---|
| Exceeded standard | 15.6% | 19.8% | 22% |
| Met or exceeded | 42.3% | 43.2% | 18% |
| Chronic absenteeism | 16.1% | 23.1% | 5% |
| Suspension rate | 6.5% | 3.3% | 5% |
- Exceeded standard
- ↓ vs CA 19.8% · index 49 · 50 = CA high-school midpoint
- Met or exceeded
- ↓ vs CA 43.2% · index 55 · 50 = CA high-school midpoint
- Chronic absenteeism
- ↑ vs CA 23.1% · index 62 · 50 = CA high-school midpoint
- Suspension rate
- ↓ vs CA 3.3% · index 37 · 50 = CA high-school midpoint
02By grade & subgroupCAASPP 2024–25 · % of tested students
ShowHide table 02 — By grade & subgroup
| ELA | Tested | EXC | MET | NEAR | NOT | MET+ | +/CA |
|---|---|---|---|---|---|---|---|
| Grade 11 | 131 | 18% | 34% | 29% | 18% | 53% | +4 |
| Math | Tested | EXC | MET | NEAR | NOT | MET+ | +/CA |
|---|---|---|---|---|---|---|---|
| Grade 11 | 132 | 13% | 19% | 25% | 43% | 32% | +8 |
We show the grade rows CDE publishes for this school. A missing grade or dash can mean the school does not serve that grade, that we hold no valid result for it, or that the tested group was too small to report. It does not mean zero.
| Science (CAST) | Tested | EXC | MET | NEAR | NOT |
|---|---|---|---|---|---|
| Schoolwide | 17 | 0% | 24% | 59% | 18% |
CAST is tested in grades 5 and 8, then once in grade 10, 11, or 12. This row is the school's all-student aggregate. Not part of the Scope Score.
| Subgroup · ELA | Tested | MET+ | vs district | vs CA |
|---|---|---|---|---|
| Socioeconomically Disadvantaged | 50 | 46.0% | +20 | +8 |
| Asian | 37 | 56.8% | — | −18 |
| Hispanic/Latino | 33 | 45.5% | +25 | +7 |
03Nearest high schoolssorted by Scope Score
| School | Dist | Scope | EXC | MET+ | Susp |
|---|---|---|---|---|---|
| River Islands High ← | — | 48 | 15.6% | 42.3% | 6.5% |
| Sierra High | 2.7 mi | 57 | 23.5% | 51.7% | 2.4% |
| Lathrop High | 1.5 mi | 51 | 14.4% | 41.5% | 4.4% |
| California average | — | 54 | 19.8% | 43.2% | 3.3% |
04More measurescontext · not all part of the Scope Score
ShowHide table 04 — More measures
AP Exam Prepared
Not offered
This school may not offer AP courses
05AP course catalog2025 - 2026
ShowHide table 05 — AP course catalog
| Subject | Taught by |
|---|---|
| Biology | this school |
| Calculus AB | this school |
| Calculus BC | this school |
| Chemistry | this school |
| Computer Science A | this school |
| Computer Science Principles | this school |
| English Language and Composition | this school |
| English Literature and Composition | this school |
| Macroeconomics | this school |
| Physics 1 | this school |
| Psychology | this school |
| Spanish Language and Culture | this school |
| U.S. Government and Politics | this school |
| United States History | this school |
| World History: Modern | this school |
Authorization ≠ a section running this year — the Ledger records what the school may teach, not seat counts.
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EXC = exceeded standard · MET+ = met or exceeded ("proficient") · Source: CA Dept. of Education · CAASPP 2024–25 · n=1,647 high schools · Vintages: climate subgroups 2019+2025 · district finance per its label · ACS 2022 · AP Course Ledger 2025 - 2026 (November refresh; authorization not enrollment) · Data updated 2026-09-18
SchoolScope scores and verdicts are our interpretation of public California Department of Education data — independent analysis, not an official rating. How we analyze · Request a correction