A or B? Or is it C or D? Which Answer to Choose?

Why are final exams so important? Every year, every student at New Trier gets stressed about the final exams. Why do teacher count final exams for so much of your grade? These are question that i wonder about every day. Final exams happen twice a year and are a good way for teacher to know how you are understanding their class. I understand that teachers make these tests to help us and see what we have learned, but what if the student is not a good test taker? I don't think that his/her grade should be brought down by the final exam because he/she is not a good test taker.
I know that tests are hard for some people and they are really hard for me. I have never been a good test taker, so when the final exams come up, i always study really hard for them, and then i end up doing really bad on them because of my test taking skills. I think that teachers should re-think what they are doing when they either make the tests too hard, or count the final exam for too many points. I think that for the kids that are bad test takers, there should be some kind of project involved to show your teacher that you have been listening and working hard.
What do you think about the final exams and how they affect your grade at the end of a semester?