Test anxiety is a natural response to a test that this both meaningful to you but is also a challenge to some degree. But too much anxiety, to the point where it is debilitating, blocking you from thinking, remembering, and performing well, is simply not a good thing. But there are steps you can take to counteract it and begin performing closer to your potential.
Follow the link to find out what these techniques are. Review them a few times and put them into practice as soon as possible. Then use them over and over again to internalize them, until they become second nature and you begin performing up to your potential.