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Conservatory Lab Charter School

Public, Charter Grades PK, KG-8
625th
SchoolDigger Rank ?
of 899 Massachusetts Elementary Schools
Better than 30% of Massachusetts elementary schools
Summary

Conservatory Lab Charter School is a PK–8 school serving 454 students at 395 Columbia Rd in Dorchester, and it operates as its own single-school district, so the "district" results in the data are simply the school's own. Overall it sits at the 30th percentile of Massachusetts schools with 2 stars — up from the 12th percentile in 2015-16 and a high of 44th in 2022-23, but with some slippage since.

English language arts is the school's strength. At 36.58% proficiency it trails the state (40.03%) by only about 3.5 points, and it is the highest ELA result of any school within about a mile, ahead of Everett Elementary School and Bridge Boston Charter School. Middle-grade ELA is especially strong: 7th grade posts 50% against a state rate of 39.91%, a 10-point advantage, and 6th grade reaches 41.3%. Subgroup results are the brightest spot — Hispanic students earned 4 stars (77th–84th percentile) in each of the last three reported years, African American students 3–4 stars, and English learner students reached 5 stars at the 95th percentile in 2021-22, though no ELL data is reported after that year.

Mathematics and science are the clear weaknesses. Math proficiency is 27.13% versus the state's 41.11% — a 14-point gap — and trails Bridge Boston Charter School by 16 points in the same city. Science has fallen from 41.79% in 2022-23, when it was above the state, to 23.29%, and civics sits at 8.7% against a state rate of 39.77%. Notably, the school spends $18,007 per student, less than nearly every nearby school, while running the largest classes in its area (16.5 students per teacher).

454
Students ?
16.5
Student/teacher ratio ?
$24,122
Per pupil spending ?
64.4%
Free/discounted lunch ?
 395 Columbia Rd
       Dorchester, MA  02125

(617) 254-8904

District: Conservatory Lab Charter (District)

Racial breakdown:

African American:
50.4%
Hispanic:
41.0%
White:
3.7%
more
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 Compare Conservatory Lab Charter School to nearby elementary schools!
At a glance
▼ Ranking trend: Recently slipping — 44th percentile in 2023 → 30th in 2026
Worth a look
!Test scores below the Massachusetts average (30% vs 41% meeting standards)
!Ranking has slipped from its 44th-percentile peak (2023) to 30th (2026)
!Civics scores 31 pts below the Massachusetts average
Students meeting standards (2025-2026) ?
This school30%
District avg30%
Massachusetts avg41%
Elementary school
625th of 899
Massachusetts public elementary schools ?
Bottom 30%▲ up 19 pts since 2016
From bottom 12% (2016) to bottom 30% (2026)
See the entire ranking list of Massachusetts Elementary Schools →
★★★★★
SchoolDigger rating ?
Middle school
234th of 478
Massachusetts public middle schools ?
Top 49%▲ up 45 pts since 2016
From bottom 6% (2016) to top 49% (2026)
See the entire ranking list of Massachusetts Middle Schools →
★★★★★
SchoolDigger rating ?
247th of 351Conservatory Lab Charter (District) among Massachusetts districts
Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)
Elementary school ranking
Show full rank history (all student groups)

All Students

YearAvg scoreStatewide rankMassachusetts percentileRating
202630.1625 of 89930.5%★★☆☆☆
202536.6582 of 90635.8%★★☆☆☆
202433.1609 of 91633.5%★★☆☆☆
202345.0518 of 92844.2%★★☆☆☆
202235.0616 of 93233.9%★★☆☆☆
202129.8664 of 93629.1%★☆☆☆☆
201930.1693 of 94226.4%★☆☆☆☆
201826.9718 of 93423.1%★☆☆☆☆
201730.8692 of 93826.2%★☆☆☆☆
201615.8824 of 93211.6%★☆☆☆☆
201440.0613 of 92633.8%★★☆☆☆
201359.8412 of 92855.6%★★★☆☆
201246.1554 of 93040.4%★★☆☆☆
201153.5482 of 92447.8%★★☆☆☆
201029.9700 of 92023.9%★☆☆☆☆
200928.3708 of 90922.1%★☆☆☆☆
200831.5674 of 90825.8%★☆☆☆☆
200733.2675 of 91125.9%★☆☆☆☆
200618.7767 of 91115.8%★☆☆☆☆
200512.9789 of 88711.0%★☆☆☆☆
20046.1840 of 8824.8%☆☆☆☆☆
200316.0753 of 88414.8%★☆☆☆☆

African American

YearAvg scoreStatewide rankMassachusetts percentileRating
202648.984 of 18855.3%★★★☆☆
202566.432 of 16981.1%★★★★☆
202456.946 of 16772.5%★★★★☆
202364.642 of 16774.9%★★★★☆
202249.772 of 17358.4%★★★☆☆
202132.6115 of 16630.7%★★☆☆☆
201943.097 of 17243.6%★★☆☆☆
201843.297 of 17444.3%★★☆☆☆

Disabled

YearAvg scoreStatewide rankMassachusetts percentileRating
202230.5459 of 67231.7%★★☆☆☆

English Language Learner

YearAvg scoreStatewide rankMassachusetts percentileRating
202282.914 of 26794.8%★★★★★
202174.120 of 24091.7%★★★★★
201969.440 of 25884.5%★★★★☆

Female

YearAvg scoreStatewide rankMassachusetts percentileRating
202629.0626 of 86928.0%★☆☆☆☆
202540.3519 of 86940.3%★★☆☆☆
202432.1606 of 88631.6%★★☆☆☆
202344.6505 of 88743.1%★★☆☆☆
202232.6610 of 90132.3%★★☆☆☆
202125.8670 of 89825.4%★☆☆☆☆
201925.6717 of 90220.5%★☆☆☆☆
201827.5687 of 89323.1%★☆☆☆☆

Hispanic

YearAvg scoreStatewide rankMassachusetts percentileRating
202664.8110 of 47576.8%★★★★☆
202569.775 of 45883.6%★★★★☆
202469.377 of 44682.7%★★★★☆
202376.352 of 42087.6%★★★★☆
202268.877 of 40180.8%★★★★☆
202167.569 of 37981.8%★★★★☆
201972.369 of 39882.7%★★★★☆
201856.4136 of 37964.1%★★★☆☆

Low Socio Economic Status

YearAvg scoreStatewide rankMassachusetts percentileRating
202639.8453 of 74238.9%★★☆☆☆
202564.9191 of 73674.0%★★★★☆
202450.2347 of 76054.3%★★★☆☆
202367.4168 of 75777.8%★★★★☆
202253.9328 of 77257.5%★★★☆☆
202140.1428 of 70539.3%★★☆☆☆
201940.3432 of 70038.3%★★☆☆☆
201833.7519 of 68524.2%★☆☆☆☆

Male

YearAvg scoreStatewide rankMassachusetts percentileRating
202633.1599 of 87931.9%★★☆☆☆
202534.5576 of 88434.8%★★☆☆☆
202435.3583 of 89134.6%★★☆☆☆
202344.0505 of 89643.6%★★☆☆☆
202238.9557 of 90838.7%★★☆☆☆
202134.8599 of 90433.7%★★☆☆☆
201935.3618 of 90731.9%★★☆☆☆
201825.6706 of 89821.4%★☆☆☆☆

Special Education

YearAvg scoreStatewide rankMassachusetts percentileRating
202631.2506 of 70928.6%★☆☆☆☆
202539.9391 of 71745.5%★★☆☆☆
202434.8467 of 73136.1%★★☆☆☆
202339.7392 of 70344.2%★★☆☆☆
202249.0436 of 90551.8%★★★☆☆
202136.2589 of 89434.1%★★☆☆☆
201940.7564 of 89637.1%★★☆☆☆
201837.2603 of 88631.9%★★☆☆☆

Tested In Person

YearAvg scoreStatewide rankMassachusetts percentileRating
202129.6657 of 92529.0%★☆☆☆☆

Tested Remotely

YearAvg scoreStatewide rankMassachusetts percentileRating
202141.4208 of 39947.9%★★☆☆☆
Middle school ranking
Show full rank history (all student groups)

All Students

YearAvg scoreStatewide rankMassachusetts percentileRating
202644.2234 of 47851.0%★★★☆☆
202538.5280 of 48442.1%★★☆☆☆
202443.4254 of 49348.5%★★☆☆☆
202342.5275 of 50145.1%★★☆☆☆
202231.4338 of 49732.0%★★☆☆☆
202118.2412 of 50117.8%★☆☆☆☆
201923.5385 of 49822.7%★☆☆☆☆
201825.7362 of 48425.2%★☆☆☆☆
201711.0443 of 4879.0%☆☆☆☆☆
20168.2452 of 4826.2%☆☆☆☆☆
201441.5284 of 45537.6%★★☆☆☆

African American

YearAvg scoreStatewide rankMassachusetts percentileRating
202668.347 of 21578.1%★★★★☆
202559.162 of 20669.9%★★★★☆
202450.989 of 20255.9%★★★☆☆
202244.8105 of 21250.5%★★★☆☆
202133.8133 of 19331.1%★★☆☆☆
201947.694 of 19551.8%★★★☆☆
201853.869 of 17259.9%★★★☆☆

English Language Learner

YearAvg scoreStatewide rankMassachusetts percentileRating
202278.75 of 15496.8%★★★★★

Female

YearAvg scoreStatewide rankMassachusetts percentileRating
202647.0222 of 46852.6%★★★☆☆
202535.1291 of 47338.5%★★☆☆☆
202437.5283 of 48141.2%★★☆☆☆
202333.3324 of 48933.7%★★☆☆☆
202226.7369 of 49425.3%★☆☆☆☆
202113.1432 of 48310.6%★☆☆☆☆
201919.7396 of 47817.2%★☆☆☆☆
201826.5356 of 46323.1%★☆☆☆☆

Hispanic

YearAvg scoreStatewide rankMassachusetts percentileRating
202682.849 of 38387.2%★★★★☆
202568.488 of 37676.6%★★★★☆
202471.579 of 37879.1%★★★★☆
202361.0112 of 36469.2%★★★☆☆
202263.796 of 36873.9%★★★★☆
202147.8147 of 33556.1%★★★☆☆
201947.4156 of 32251.6%★★★☆☆
201840.8187 of 30939.5%★★☆☆☆

Low Socio Economic Status

YearAvg scoreStatewide rankMassachusetts percentileRating
202666.7104 of 46177.4%★★★★☆
202554.5177 of 46461.9%★★★☆☆
202459.2157 of 46966.5%★★★☆☆
202348.1230 of 48152.2%★★★☆☆
202251.6199 of 48959.3%★★★☆☆
202128.9356 of 46222.9%★☆☆☆☆
201934.6318 of 45229.6%★☆☆☆☆
201844.1260 of 43840.6%★★☆☆☆

Male

YearAvg scoreStatewide rankMassachusetts percentileRating
202639.1263 of 47044.0%★★☆☆☆
202555.9187 of 47360.5%★★★☆☆
202459.3171 of 48364.6%★★★☆☆
202353.4206 of 48957.9%★★★☆☆
202237.8293 of 49741.0%★★☆☆☆
202124.6362 of 48525.4%★☆☆☆☆
201821.4374 of 46619.7%★☆☆☆☆

Special Education

YearAvg scoreStatewide rankMassachusetts percentileRating
202247.0236 of 50353.1%★★★☆☆
202124.9401 of 48918.0%★☆☆☆☆
201934.6332 of 48431.4%★★☆☆☆
201846.2238 of 46749.0%★★☆☆☆

Tested In Person

YearAvg scoreStatewide rankMassachusetts percentileRating
202117.3409 of 49116.7%★☆☆☆☆

Tested Remotely

YearAvg scoreStatewide rankMassachusetts percentileRating
202126.1254 of 33925.1%★☆☆☆☆
How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)
Elementary school
English Language Learner (2022)95th percentile+61 vs school
Hispanic (2026)77th percentile+46 vs school
African American (2026)55th percentile+25 vs school
Tested Remotely (2021)48th percentile+19 vs school
Low Socio Economic Status (2026)39th percentile+8 vs school
Male (2026)32nd percentile~ school
Disabled (2022)32nd percentile~ school
Tested In Person (2021)29th percentile~ school
Special Education (2026)29th percentile~ school
Female (2026)28th percentile-3 vs school
Middle school
English Language Learner (2022)97th percentile+65 vs school
Hispanic (2026)87th percentile+36 vs school
African American (2026)78th percentile+27 vs school
Low Socio Economic Status (2026)77th percentile+26 vs school
Special Education (2022)53rd percentile+21 vs school
Female (2026)53rd percentile~ school
Male (2026)44th percentile-7 vs school
Tested Remotely (2021)25th percentile+7 vs school
Tested In Person (2021)17th percentile~ school
By subject vs Massachusetts (2025-2026) ?
English Language Arts37%-3 vs state
Mathematics27%-14 vs state
Science23%-18 vs state
Civics9%-31 vs state

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Frequently Asked Questions about Conservatory Lab Charter School

Conservatory Lab Charter School ranks 625th of 899 Massachusetts elementary schools. SchoolDigger rates this school 2 stars out of 5.

In the 2024-25 school year, 454 students attended Conservatory Lab Charter School.

Students at Conservatory Lab Charter School are 50% African American, 41% Hispanic, 4% White, 3% Two or more races, 1% Asian.

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Latest Massachusetts data All new data »
2024–25 dropout rates & graduation ratesMar 5, 2026
2024–25 MCAS Next Generation test scoresSep 29, 2025
2023–24 school spending dataMay 8, 2025
2023–24 dropout rates & graduation ratesMay 1, 2025


SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the Massachusetts Department of Elementary and Secondary Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.

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