For all of my subjects, I am in a position that I could fail the exam pretty horribly, but still pass the course. For physics, I could not show up, and still be in a better position than most people if they got 90%. But something has kept me working hard all weekend.
We have all heard the argument that exams aren't worth anything. That a mark is just a number - and it doesn't define your life, or who you are. But I think it does. It might not define who you are as a person, or what your future is going to be like. But it shows how committed you are to the exam at hand. Now, teacher can and will tell you not to stress about exams, but you will. And you are completely justified in stressing.
If you stress, exams obviously mean something to you. And that is a good thing. So when it comes to exams, just remember that stress is a good thing - but don't let it affect the outcome of your work.
For me, I have put in a lot of hard work over the course of the semester - and I am in a good position going into these exams. I have high hopes for what I can achieve here, and I am ready to go at them with full force and do my best on every single one.
For everyone else out there who is undergoing exam stress right now - take a deep breath, relax, and walk away from the work for half an hour. Explain to yourself, or to someone else, why you are so stressed over these exams. Maybe then you will see why being stressed is illogical, and then make sure the stress doesn't affect your work. You will do great, I promise.