Building 21 is a school servicing grades 9 to 12 and is located in the district of "Philadelphia City School District" in Philadelphia, PA. There are a total of 357 students and 13 teachers at Building 21, for a student to teacher ratio of 28 to 1.
Building 21 has an average proficiency test score (in mathematics and languages) of 20.0%, which is 64% lower than the Pennsylvania average.
| Students/Teachers | |
| Students | 357 |
| Teachers | 13 |
| Student/Teacher ratio | 28:1 |
| Advanced Placement | |
| AP enrollment | n/a |
| Taking some courses | n/a |
| Taking some courses (not tests) | n/a |
| Passing some courses | n/a |
| Passing no courses | n/a |
Advanced placement (AP) is a program that offers high school students the ability to take college level courses and exams. These programs were created to be at the same level of most first year university courses. If the students were successful in the AP programs, they could potentially receive advanced placement, credit or exemptions when they go on to university. At Building 21, there are a total of n/a students enrolled in advanced placement courses, with n/a taking some courses.
| Grade | Proficiency |
| All | 8% |
| 3 | n/a |
| 4 | n/a |
| 5 | n/a |
| 6 | n/a |
| 7 | n/a |
| 8 | n/a |
| High School | 6-9% |
| Grade | Proficiency |
| All | 32% |
| 3 | n/a |
| 4 | n/a |
| 5 | n/a |
| 6 | n/a |
| 7 | n/a |
| 8 | n/a |
| High School | 30-34% |
The proficiency in math and languages tables represent the percentage of students that scored at or above the proficiency level on their standardized state assessment tests. Although these tests are standardized within each state, the tests may vary from state to state. Comparing the results of one state to another may not always be an accurate or fair comparison.
| Race | School | District | Pennsylvania | National |
| White | n/a | 15.5% | 68.3% | 51.1% |
| Black | n/a | 53.0% | 14.4% | 15.9% |
| Asian | n/a | 7.0% | 3.6% | 4.7% |
| Hispanic or Latino | n/a | 19.4% | 10.4% | 23.6% |
| American Indian and Alaskan | n/a | 0.3% | 0.2% | 1.2% |
| Hawaiian | n/a | 0.1% | 0.1% | 0.4% |
| Multiracial | n/a | 4.8% | 2.9% | 3.1% |
| Statistic | Philadelphia | Pennsylvania | National |
| Population | 1,581,531 | 12,801,989 | 328,239,523 |
| Population density (sq mi) | 11,771 | 287 | 91 |
| Median age | 34.6 | 40.6 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 39% | 56% | 55% |
| Speak English | 77% | 89% | 79% |
| Speak Spanish | 11% | 5% | 13% |
| Index | Philadelphia | Pennsylvania | National |
| Completed 8th grade | 79.9% | 86.9% | 84.3% |
| Completed high school | 78.5% | 85.6% | 83.0% |
| Completed some college | 49.1% | 53.6% | 59.4% |
| Completed associate degree | 31.9% | 37.4% | 38.5% |
| Completed bachelors | 26.3% | 29.3% | 30.3% |
| Completed masters | 10.9% | 11.5% | 11.5% |
| Completed professional degree | 3.7% | 3.3% | 3.3% |
| Completed doctorate | 1.4% | 1.4% | 1.3% |