What vow did Cholkar make to Sai Baba, and why was it so important for his survival?

Cholkar, who came from a poor household, made a vow to Sai Baba that was critical for his livelihood. As described in Chapter 15, his job and salary depended on passing an examination. With his daily bread at stake, he made a firm resolve: if he passed the exam by Baba's grace, he would present himself at Shirdi and distribute sugar candy (khadisakhar) in Baba's name. The vow was deeply important because failing the exam meant his candidacy would be lost, jeopardizing his ability to support his household.