What is the meaning of the first mercy chance at Kurukshetra University?

Kurukshetra University gives you 3 attempts to clear your exam. If you fail at all those three chances the university gives you a mercy chance to clear that examination. 

But since there are some students who are still unable to clear these mercy chances. So now they have been categorized as first and second mercy chances. Here as long as you can pay for the form and have time you can continue giving your exams.