Thanks, it is natural to be worried; it is even worse the first time. I remember everybody felt a mixture of worry, anxiety, and fear before exams. A couple of points:
If this is for a college:
- Exams can be repeated (sometimes even more than once).
- You can usually repeat the whole course the next year.
- It all depends on the college, but failing exams is not as catastrophic as it might seem. In some difficult classes, more than half of the people fail on their first attempt. And they continue and finish their studies.
- Failing exams is a 'normal' part of college studies; many people experience it.
If this is some kind of secondary school leaving exam:
- These usually have a high success rate, but failure is again not catastrophic.
- They can also be repeated, usually only the classes/courses failed, so it is actually easier the next time.
I would suggest researching the rules and understanding what happens if you fail. Typically, it is not horrible at all. You will be required to repeat only the parts you fail, which is easier than studying everything at once for the first time.
About your parents: They are people too, so it is impossible for me to know how exactly they will react, but you may try to openly share your worries with them.
Given my low self-esteem, I usually set low expectations with them while studying. I told them I was unsure if I would pass the exams, how difficult it was, and I never committed to or promised anything.
Anyway, good luck with your exams.