Hello Gokul,

Don't worry, such problems do arise while dowoading or reviewing the admit card. There might be some kind of techincal glitch.

1. Make sure you have a good internet connection while you are trying to review the admit card, because sometimes due to poor connection, the entire page cannot be loaded and the option for the same cannot be seen. 

2. Check once again the date for the admit card to uploaded on to the site. If the date for the release of the admit card has already passed and yet you can't see the details of your admit card, then you can contanct the authorities as well. 

Make sure to check both of the above mentioned points and I hope it helps you solve the problem.

All the best for your upcoming exam.