Hello aspirant,
No, it will not be required during admissions. For the admissions, you will require are-
Neet Admit card
Neet Rank letter
Provisional allotment letter
Class 10 mark sheet
Class 12 mark sheet
Reservation proof
Identity proof
Birth certificate

Dear candidate... hope you're doing good..

Well, no you may not need the admit card of class 12 at the time of admission in a Bihar state government medical college. You may be asked to produce the pass certificate and marksheet of the senior secondary examination at the time of admission.

Hope this helps you out....

All the best:)