It does not matter if paper is in sets or not. Cheaters will always cheat in any exam
Let me give an example of a very big exam in India:
When i entered the exam hall ... I saw people chatting
I did not know the reason ..Thought they must be from same college or something
But then understood from their conversation that they are all from same coaching centre
They know each other very well...including strengths and weaknesses
As usual the invigilator was a happy go lucky type guy who had come to do time pass in the exam hall
That is a general trend you can see in many places and individuals
So these people inspite of different sets where still chatting and doing the exam
SO FORGET IT .................. AFTER ALL THIS IS INDIA
When we do not want to improve any system then why blame it