I think you should not go to school if you have a very bad earache. This is because it could be a serious ear infection problem that requires immediate attention. You should go to your doctor for the right diagnosis and treatment.
It might be an ear infection My sisters ear hurt really bad so my mon took her to the doctor and they just needed to be cleaned out. Mao try that maybe first of that don't help than go to the Doctor and I wouldn't go to school
Have you swam any time soon? If so it could be Swimmers Ear and I had it once and had to go the doctor for it. It could also be an ear infection. I don't think you should go. It could affect your attention span.
If you haven't been to the dr you should go. Ear infections, left untreated can cause major infections and even hearing loss. The infection can spread to your brain and cause meningitis. You probably need antibiotics to clear up the infection if you have one. Listen to your grandma.