Hello,

I totally understand your situation. Keep preparing for the exam. If your family member is infected, doesn't mean you are also infected. But Yes, there could be a problem if you show any kind of symptoms like coughing but hiccups are not being considered as one of the symptoms of COVID-19. I strongly suggest you for a COVID-19 test, and if your result remain negative then you can show it at the examination centre. And there wouldn't be a problem at all.

Good Luck.