Central Board Of Secondary Education [CBSE] — my school not giving my 12th admit card

I am a student of class 12 science group of d a v centenary public school amlohri distt singrauli (Mp). My senior teachers and principal saying me that they do not give me my admt card because i am not present in there internal self satisfaction retest which is held from 12th february to till.. I am not present in it because i want to concentrate my board exam if i go there for formulaties due to this i am not able to give my best in board which is most important for me.. But now i am in stress please do something sir any how give me my admit card.. Please take some step for my future sir