Helping others in MCQs is quite common practice in CSS Exam according to my observation. Moreover, in some cases I saw people who used clear a question and ask some points from fellow candidates. You can't imagine two friends each other from a long distance in MCQs portion when they gave clues and hints.

Helping each other in examination hall is bad practice and can't be appreciated but good aspect is that examiners remain strict and impartial and they don't allow help from outdoor via cell phone etc. or common kartoos culture. I don't think that a person by helping other will affect the fair recruitment procedure. What about Essay?