Can you tell me the complete story of Cholkar, his vow regarding the examination, and how Sai Baba acknowledged it?

Cholkar, a man from a poor household, needed to pass an examination to make his job permanent. As detailed in Chapter 15, he made a vow to Sai Baba that if he passed, he would distribute sugar candy (khadisakhar) in Shirdi. He succeeded but faced financial difficulties, described as the 'threshold-ghat,' which delayed his journey. As a personal penance for this delay, Cholkar gave up sugar entirely, even in his tea. When he finally reached Shirdi and fulfilled his vow, Baba demonstrated his omniscience. He instructed a devotee, Jog, to give Cholkar 'cups of tea, well-filled with sugar.' This specific instruction amazed Cholkar, proving that Baba knew about his secret sacrifice, confirming his faith.