C+ Top 70%

Conservatory Lab Charter School

Grades PK-08 BOSTON, MA

Moved up 11 places from 2024 to 2025

#246 State Rank
C- District Grade
395 Columbia Road, BOSTON, MA 02125
Diverse
Rating sources & methodology MCAS scores from 2025 Data updated September 2026
467 Students
94.7% Attendance Rate
36.7 Composite Score
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MCAS score comparisons

Students meeting or exceeding expectations · 2025 results

Each subject shows the average of published grade percentages, without weighting by enrollment. The bars compare available years on a 0–100% scale. Grade coverage and student groups can change between years.

CIV

12% Meeting or exceeding expectations

English Language Arts

37.8% Meeting or exceeding expectations

5.6% exceeding expectations

2023 43% 43%
2024 36.3% 36.3%
2025 37.8% 37.8%

Mathematics

28.7% Meeting or exceeding expectations

7% exceeding expectations

2023 30.2% 30.2%
2024 25.7% 25.7%
2025 28.7% 28.7%

Science

23% Meeting or exceeding expectations

4% exceeding expectations

2023 40.5% 40.5%
2024 34.5% 34.5%
2025 23% 23%
View published results by year and grade
Available grade results for the latest 3 published years. An em dash means the value was not published.
YearSubjectGradeMeeting+Exceeding
2025CIV08 12%—
2025English Language Arts03 38%6%
2025English Language Arts04 33%7%
2025English Language Arts05 33%4%
2025English Language Arts06 51%7%
2025English Language Arts07 40%4%
2025English Language Arts08 32%—
2025Mathematics03 35%10%
2025Mathematics04 33%5%
2025Mathematics05 27%6%
2025Mathematics06 33%—
2025Mathematics07 28%—
2025Mathematics08 16%—
2025Science05 26%4%
2025Science08 20%—
2024English Language Arts03 30%2%
2024English Language Arts04 39%9%
2024English Language Arts05 40%—
2024English Language Arts06 43%12%
2024English Language Arts07 31%4%
2024English Language Arts08 35%5%
2024Mathematics03 24%2%
2024Mathematics04 35%5%
2024Mathematics05 18%—
2024Mathematics06 24%2%
2024Mathematics07 8%—
2024Mathematics08 45%—
2024Science05 24%—
2024Science08 45%5%
2023English Language Arts03 43%2%
2023English Language Arts04 52%6%
2023English Language Arts05 47%10%
2023English Language Arts06 49%15%
2023English Language Arts07 29%—
2023English Language Arts08 38%—
2023Mathematics03 24%2%
2023Mathematics04 45%2%
2023Mathematics05 24%—
2023Mathematics06 15%—
2023Mathematics07 29%4%
2023Mathematics08 44%—
2023Science05 43%12%
2023Science08 38%6%

MCAS subject percentages differ from the composite school rating, which combines available academic and school indicators. Letter grades and state ranks compare schools at the same level. A rank change describes relative position, not a percentage-point change in test scores. Read the rating methodology.

Student Demographics

467 students enrolled

Race/Ethnicity

Black 50.7%
Hispanic 41.5%
White 3.6%
Multiracial 2.4%
Asian 0.6%

Gender

48% Male
52% Female

Student Programs

English Learners 10.9%
Special Education 22.9%
Free/Reduced Lunch 70.2%

School Performance

Key metrics and program information

Attendance

94.7% Attendance Rate
15.1% Chronic Absence

Staffing

Location

395 Columbia Road, BOSTON, MA

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C+-Rated School

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Frequently Asked Questions

What is Conservatory Lab Charter School's grade rating?

Conservatory Lab Charter School has earned a grade of C+, ranked #246 in Massachusetts, placing it in the top 70% of Massachusetts Combined schools. This rating is based on 2025 MCAS test scores, attendance rates, and other performance metrics from the Massachusetts Department of Elementary and Secondary Education.

How many students attend Conservatory Lab Charter School?

Approximately 467 students are enrolled at Conservatory Lab Charter School.

How does Conservatory Lab Charter School perform on MCAS tests?

Based on the most recent MCAS results, Conservatory Lab Charter School's proficiency rates are: CIV (12% proficient), English Language Arts (38% proficient), Mathematics (29% proficient). MCAS (Massachusetts Comprehensive Assessment System) tests measure student achievement in English Language Arts, Mathematics, and Science.

What is the attendance rate at Conservatory Lab Charter School?

Conservatory Lab Charter School has an attendance rate of 94.7%. Strong attendance is correlated with better academic outcomes.

What school district is Conservatory Lab Charter School part of?

Conservatory Lab Charter School is part of Boston School District. For enrollment information, contact the district office or visit the school's website. Enrollment typically requires proof of residency within the district boundaries.

How are Massachusetts school ratings calculated?

School ratings are calculated using multiple data points from the Massachusetts Department of Elementary and Secondary Education (DESE), including MCAS test scores (proficiency and growth), attendance rates, graduation rates (for high schools), and student-teacher ratios. Schools are ranked by percentile against similar schools statewide.