Since you have a lot of time, plan out your studying accordingly. Determine goals for each week, and divide up the content so that by the time the test rolls around you have covered everything. There's no need to stress! At least you're planning early.
Taking an exam can be broken up into several elements, all of which you can control. The first is the material. Assuming there is no trickery or hidden agenda, you should know the material over which you will be tested. If that's so, break it down into its most basic components: facts, figures, problems, issues, skills, whatever those are. Use flash cards, practice writing essays, do whatever it takes to prepare yourself academically. The second is you. Get rest and sleep and eat properly in an attempt to keep your body stabilized, even if your mind is racing. Keeping a regular schedule or routine will be a huge help in your preparations--and make sure you sprinkle in something fun and relaxing, as well. The last is your emotions. It's so easy to see one exam as the be-all and end-all of your life right now. Put it into the proper perspective and understand there will be another exam, another opportunity to succeed and to demonstrate your skills and knowledge. This is not the end of life, whether you're a dismal failure or wildly successful on this exam. Best of luck!
One way to relieve anxiety about a test is to be prepared for the test. If you still have six weeks before the test you have plenty of time to prepare for the test. Also as someone else said relax and get some rest prior to the test day.
First of all, you need to relax. I know that this is easier said than done though. I find that preparation always leads to more self confidence. If you did not care about your grade you would not be so worried. I have a feeling that you will be well prepared but still experiencing some test anxiety. Remember to get plenty of sleep before your exam and take a few deep breaths if you start to feel any anxiety. Also, take your time. It may also be a good idea to share your feelings with the school counselor. He or she should be able to give you some great advice.
I think that you are identifying the challenge in front of you with plenty of time to do something about it. This is important. Obviously, you will have to take this exam and cannot avoid it. The first thing that you need to do is to secure a good idea of what is going to be on the exam. This might involve opening a dialogue with the teacher/ instructor, something that I think you are going to have to do at some point anyway. Perhaps, this involves looking over the course syllabi or a potential study guide given. You will have to make sure that you have a clear and solid grasp on what will be the exam. Once you have secured this, I think that the next step is to go through on a nightly basis reviewing and making sure you are clear on the concepts that will be on the exam. This will involve a laundry list of identifying, reviewing, consigning to memory, and making sure you are clear on these concepts. Pick a concept a night. You have enough time that this can be done. If you are unclear about a concept, write out everything that causes you confusion and be specific about it. With this list, approach your instructor/ teacher and see if they can help you. If not, seek out a colleague in your classroom or, if it can be done, a tuition center to assist you. In making sure you know what is covered and are clear on it, I think that the process of reviewing for this exam goes much easier and affords you a better chance of doing well on it.
I will take a look at again the list of chapters/topics that have been covered on my class sessions. Then, I will make a list of topics/chapters or sub-chapters that I still need to revisiting. Using this list, I will make another list on my learning schedule about what I have to learn every single day or at least 2-3 days in a week. Based on that schedule, I will review those chapters. If the book or content really huge, usually, I try to predict what is the most important and what is the less important to learn more deeply. Six weeks for preparing a test on a 2-3 credits hours course is more than enough. With one condition, I am have a certain level of understanding of what I have already learn in the class or during the process. However, if you have less understanding about what you learn in class, six weeks is good enough for preparing to reach a passing grade.