It is quite simple. Too much test anxiety inhibits your ability to exercise your intelligence. The good news is it is very malleable, hence you can decrease your test anxiety, thus increasing your ability to perform cognitive tasks – committing new information to memory and answering questions about what you have learnt.
Already primed to think in this direction whilst reading Daniel Goleman’s Emotional Intelligence, it seems that your emotional brain (the pre-historic part of your brain) is extremely powerful and exerts a tremendous amount of influence over your ability to use your intelligence. Left unchecked, your emotional brain reigns supreme, thus inhibiting your cognitive performance. Not what you want when you are trying to do well in your studies.
Here is the good news. Your rational brain has the capacity to regulate your emotional responses; in fact, you can train this ability. Mastering (finally, I managed to slip that word in to a blog again!) your emotions can lead to improved control over impulses, which helps you develop the habits you need to cultivate to improve your study results.
One does not simply… excel in academia. It requires dedication and devotion; perhaps emotional mastery is the first step. And it is not even a university course.
Test anxiety is an emotion; fear. A very powerful emotion which primes your body for many things, but not for excellent cognitive performance. It is not that you are not intelligent, you are not letting your intelligence flourish when you let fear take command of your brain.
Study. Practice. Talk to your peers. Take a course in test taking. If you put some conscious effort into training, your test anxiety decreases and, yes, your test performance will increase.