The D.C. public school system’s college-level test participation rate increased slightly in 2005, with the largest high school, Wilson, making the greatest gain, according to The Washington Post Challenge Index survey of area schools.
The participation rate for D.C. schools, calculated as the number of college-level tests per graduating senior, went from 0.776 in 2004 to 0.820 in 2005, an increase of almost 6 percent