Building 21
388
Students
19.2:1
S:T Ratio
School Snapshot
Key metrics at a glance950
B-
19:1
B-
This Week at Building 21 – August 18, 2026
51 students practicing on Varsity Tutors
Academic Pathways
Explore 83 courses in the 2025-26 catalog for Building 21
Standardized Test Dates
Upcoming national, state, and school calendar dates that affect students at Building 21.
National Tests
August 1, 2026 – November 30, 2026
ISEE — Fall Testing Season
August 3, 2026 – June 30, 2027
SSAT — Flex Testing
August 22, 2026
SAT — National
August 28, 2026
SAT — National
September 1, 2026
ACT — National
September 1, 2026
SAT — National
State Assessments
December 7, 2026 – December 18, 2026
Keystone Exams — Algebra I
December 7, 2026 – December 18, 2026
Keystone Exams — Literature
December 7, 2026 – December 18, 2026
Keystone Exams — Biology
January 4, 2027 – January 15, 2027
Keystone Exams — Algebra I
January 4, 2027 – January 15, 2027
Keystone Exams — Literature
January 4, 2027 – January 15, 2027
Keystone Exams — Biology
After Building 21
Where graduates go and what they studyTemple University
Community College of Philadelphia
Commonwealth University - Bloomsburg
Shippensburg University of Pennsylvania
Penn State
Kutztown University of Pennsylvania
Drexel University
Cheyney University of Pennsylvania
Business
Nursing
Psychology
Criminal Justice and Law Enforcement Administration
Biology
Small Business Management
Animation, Video Graphics and Special Effects
Accounting
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SAT Prep
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ACT Prep
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Study Coach
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1:1 Tutoring
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Live Classes
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Practice Hub
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6501 Limekiln Pike, Philadelphia, PA 19138
(215)400-7450
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Philadelphia City School District
Academic Calendar
Important dates, holidays, and school events