Without standardized testing how would anyone know what is being taught in schools? Reading and math?
http://www.dcpcsb.org/data/files/fast%20facts%20-%20october%202013%5B1%5D.pdf
On page 4 is a comparison of % proficient and advanced:
Math

CPS -53 Charter -58.6
Reading

CPS-49.5 Charter-53
That DCPS number includes all the elementary schools like Mann etc with high in boundary participation rates. Wilson etc. Ward 3 plus Ellington, etc. Remove those and the charters serving 72% low income students I assume would be dramatically higher than DCPS.
43% of students attend charters. In boundary for Drew attending is 19%. Some wards have higher percentages attending charters than attending DCPS-ie 63% in Ward 1.
http://www.washingtonpost.com/local/education/despite-dc-public-school-gains-system-trails-behind-large-city-average/2013/12/18/481bb332-67e2-11e3-a0b9-249bbb34602c_story.html
"Charter schools, which enroll 44 percent of the city’s students, outperformed the school system by significant, double-digit margins in eighth-grade math and reading.
But the two sectors posted virtually the same average scores in fourth-grade math and reading, with the school system besting charters by just one point in both subjects. "
The article above was from 2013-again the DCPS numbers include the ward 3 high inboundary attendance schools.