Which exam are you really talking about? There are plenty of entrances happening on 13th May 2018, you see?

To get correct details you need to give us the correct details too in your question, you didn't mentioned the name of the engineering enterence exam you are talking about , it is difficult for us to go and search for all the engineering exams that will be conducting on 13 may and predict what exam details you want so please make sure of this next time, as long as i remember ComedK is on 13 may so the admit card of ComedK will be avilable from may 4 to may 12 and if my guess is wrong please mention your concerned exam name. 

Good Luck!!