What was Cholkar's problem, and what vow did he make to Sai Baba to solve it?

According to the account in Chapter 15, a man named Cholkar faced a significant challenge where his entire livelihood depended on passing an examination to make his job permanent. In a state of humility, he prayed to Sai Baba, making a firm vow. He promised that if he passed the exam by Baba's grace, he would travel to Shirdi, present himself at Baba's feet, and distribute sugar candy, or 'khadisakhar', in Baba's name. This vow was a heartfelt plea for assistance in a situation where his daily bread was at stake.