Central Board Of Secondary Education [CBSE] — Online class

We are student of Kendriya Vidyalaya, Class 11.
Due to poor network, we are getting trouble to attend class sometimes, we can't hear voice of teacher, etc. Sometimes we are getting removed from class automatically due to poor network.
Due to which our attendance ratio is getting low.
So our teacher is telling that they will not permit us to give exam for low attendance.
For all there reason we are facing too much trouble.