experience, good communication or can manage impact. However, if someone needs 50% support from his supervisor and team-mates and 50% by himself , that is painful for the team mates. You cannot understand/judge/evaluate the real picture by seeing these statistics.
For YO, The score is from January - June 2016. He was doing good at that period. Recently, he starts not understand both Thai and English language from BA and myself. As I told you his problem is not fully technical, his problem is human nature/manner/thinking. I need all of your help to make him mature which I cannot help. From the first day, almost every day, I am teaching him sitting beside me or I sit beside him.