US President Barack Obama has exhorted American students to toil harder at school to beat the Bangalore challenge. He said,their success would determine the country's leadership in a world where children in Bangalore and Beijing were raringto race ahead. He was addressing students at a school in Philadelphia, Pennsylvania, President Obama has repeatedly said that American schools would have to ensure that they continue producing leagues of top professionals, so that the American hegemony in human resource continues in this century.Last year, while announcing an end of tax incentives to US companies which created jobs overseas, Obama had launched the 'Say no to Bangalore and yes to Buffalo,' slogan. Since then, he has time and again mentioned the competition coming in from developing countries like China and India while asking Americans to rise to the challenge to keep the American supremacy alive.