Do I have to take an exam to get a health certificate?

No, just go to the hospital for a check-up. It is similar to or even more convenient to have a physical examination at school. It is necessary to draw blood ~

Suggest going in the morning. It can be finished before ten o'clock, and you can get the health certificate in the afternoon. This is quick, and there are more complicated ones, but generally you need to provide a health certificate when you go to the company for an interview. This ordinary one is enough.