From New York Times:

This article discusses the efforts of the National Math and Science Initiative (NMSI), a nonprofit group that seeks to improve teaching of science, math, technology, and engineering. In addition to offering training and resources to teachers in high schools that are not high-achieving, NMSI also pays $100 to students and $100 to teachers for each passing score on Advanced Placement (A.P.) exams. The initiative has been successful thus far: for participating schools, the number of passing scores on science and math A.P. tests increases, on average, 85 percent the first year, and nearly triples by the end of the three-year program.