Hello aspirant,

If the mistake is in admit card, it is not possible to correct it. But there would be no problem at the exam centre. You may attempt exam with confidence. There might be some problems at counselling centre. But After your paper you may visit  the CBSE head office( probably located in one of the metro cities in your state) and ask them for the correction ( A minimal fees is charged for it). 

Ask below if further help is needed.

Currently focus well on your studies.

BEST OF LUCK!!!