What specific problem did Cholkar face, and what vow did he make to Sai Baba to overcome it?

Cholkar faced a significant financial challenge, as his livelihood depended on passing an examination to make his job permanent. As described in Chapter 15, he was from a poor household and feared losing his daily bread if he failed. To seek divine help, he made a firm resolve and vowed to Sai Baba that if he passed the exam by Baba's grace, he would present himself at Shirdi and distribute sugar candy, or 'khadisakhar', in Baba's name. This vow was made out of desperation and hope for a stable future.