I am a student of class 12th studying in Holy Hearts Educational Academy, Raipur.I had opted for computer science as my optional subject. But, now I am having difficulty in the very subject. I had even given an application to the principal. But, she informed me saying that my optional subject cannot be changed as CBSE has send the rejection letter. I have already taken PCB and it will be very difficult for me to study CS. Please tell me will it be possible to change the subject..???