I would like to say that it is equally possible that mistake may be from the examiners side not from the student side. After all they are also human beings not GOD that they cannot make mistakes and it is also equally possible that their may be something fishy. we cannot totally ignore that thing. I know those type of css candidates who only depend on luck and after failing they say that someone has done conspiracy against us but I also know some students who gave excellent papers and still were not selected and students who were not so good got higher marks. css is the exam handled by human beings and those who are conducting the exam we cannot give them free hand that ok they are mistake less and there will be no mistake from them.