Dear aspirant,

It is necessary to know admit card of which exam is lost as processes of getting admit card is different for different exams. For some exams students need to call the authorities directly.

In some cases, authorities allow the students to log in once again in your account and download it once again.

So you, need to contact the respected authorities for this issue.

But if you have screenshot or photo then you can show that also to the authorities. Authorities might consider it.

Hope this helps.