Oli's child marriage crusade
Oli lives in Bangladesh, where he campaigns against child marriage.
He's just 12 years old, but has halved the amount of child marriages in his area by going around his slum and standing up to his elders, telling them why they shouldn't marry off their daughters so young.
Bangladesh has one of the highest rates of child marriage in the world, with 20% of girls becoming wives before their 15th birthday, even though 18 is the minimum age allowed by law.
Schools World Service is a BBC British Council co-production.