Saheb's life changes significantly when he starts working at the tea stall. The following points explain how his life changes:

Financial stability: Saheb's family was struggling to make ends meet, and his father was an alcoholic who spent most of his earnings on drinking. Saheb's job at the tea stall provided him with a steady income, which helped his family to have financial stability.

Education: Saheb was unable to attend school because of his family's financial situation, but his job at the tea stall allowed him to save money to pay for his education.

Independence: Saheb's job gave him a sense of independence that he had never experienced before. He was able to make his own decisions and contribute to his family's income.

Exposure to the world: Working at the tea stall exposed Saheb to the world beyond his slum. He was able to interact with people from different walks of life, which broadened his perspective.

Self-respect: Saheb's job at the tea stall gave him a sense of self-respect. He was no longer dependent on his father's earnings, and he was able to contribute to his family's income.

In conclusion, Saheb's life changed for the better when he started working at the tea stall. He was able to provide financial stability to his family, attend school, gain independence, broaden his perspective, and gain self-respect.