why was patol babu was a meticulous man

I do not see any character listed in the Diary of Anne Frank by this name. I knew I did not recognize the name, but I checked anyway.... just in case. 

Patol Babu was indeed a meticuluos man. When he got his dialogue, monosyllabic exclamation 'Óh!' he tried his best to give his best. Firrst he tried to understand different inflections of 'Oh!' when spoken in different tones carrying different meanings. He was a true actor. He enunciated the syllable in various ways. Alongwith, he worked out how he would react physically when the collison takes place, how his features would be twisted in pain, how he would express pain and surprise. He performed in various ways in front of a large glass window. When his turn came, he even suggested for a rehersal. He calculated his steps and timed it excellently well. All these things shows his hard work and pain taking attitude.