I am appearing for class 12th cbse boards this year.I have Physics,Chemistry,Biology,English and Physical education as my 5 main subjects along with 6th subject Maths.

Can I be ABSENT on the day of maths exam as i am not really confident of passing it. What are the consequences of not appearing for the 6th (optional) subject? Will I get compartment in the subject if I'm absent on the day of 6th subject exam?? Or will they declare it pass if I pass in 5 main subjects and am absent in the 6th? Is it compulsory to give all the 6 exams mentioned in my admit card?