Exams or Demon Fighting?
You have two options in life and two options only
Learn your stuff, pass your exams and have a happy and prosperous future.
Don't bother with the exams, find a demon portal and spend your few remaining seconds, minutes or days battling the repulsive beasts of the undead until one of them kills you in a hideous and painful way.
Have a really good think before deciding. This is one of the most important
decisions (and if you choose B, possibly the last) you'll ever make.
When you're ready, click on your door of destiny and let your path unfold...