Hi aspirant,

See it would not be possible to download the admit cards of 10th and 12th CBSE board examinations directly from their websites now, however marksheets could be made available through digilocker application. Incase you need the admit card only then there is no other option except visiting the regional CBSE educational office and request the authorities regarding the issue. Those people may provide you a duplicate copy of the Admit Card or suggest the best possible solution.

Hope it helps!!