average. reporter: educators say it takes three to five years for standardized test scores to go up. so far 300 schools have tried it. half would not stick with it. this is really hard. superintendents last two, two and a half years on average. it s hard to lead systemic change when you have that much turnover. reporter: though state test scores here have not gone up, principal gould is still on board. why? she says discipline problems dropped 76% since the change. and students now are more motivated than ever. debra feyerick, cnn, westminster, colorado. we ll examine the crisis in our public education system and why america s future is at risk. a cnn documentary called don do fail me will air here on sunday at 8:00 p.m. people have been fighting for years trying to find a