Indian Prime Minister Narendra Modi's carefully built image of invincibility is facing its toughest test yet, analysts say, after his government backed down in the face of youth-led protests over exam irregularities and jobs prospects. "The resignation is definitely a surprise, because it is not in Mr. Modi's temperament to take a back step," analyst Nilanjan Mukhopadhyay, who has written Modi's biography, told AFP. The protests have also dented the perception that Modi and his ruling right-wing Bharatiya Janata Party (BJP) were invincible, Bose said. Advertisement AdvertisementAdvertisement AdvertisementFor India's fragmented opposition, the protests have offered a rare opportunity to pressure the government. "Social media has now permeated to the smallest towns in India, and has near ubiquity among young Indians," he told AFP.