I have done that PD class. I have learnt many things.There were many faults in myself before the class.I learnt many good manners such as dicipline, respecting and talking respectfully with everyone, not to shout in between of everyone, how to control anger, not be with bad persons, to complete everything on time, how to make perfect timetable, speak with soft voice , not to speak bad words and mutual understanding and to serve guests and everyone.With study, it was also some fun in class. You can also join it.