The MCAT is not like another test or assignment.
Yes, it is. I don't mean to argue that it is EXACTLY like other assignments or tests (Duh). Each test, or each exam, standardized or otherwise, has its own quirks, content focus, structure, etc. However, I believe that it is important to attack the MCAT the same way you would any other test, and in this respect, it IS like any other test or assignment: Figure out what will be tested, form a study plan, concentrate on any weaknesses, and practice, practice, practice until you are satisfied with how you are doing on practice problems or in this case, practice exams. Doing well on exams isn't rocket science, and especially in this day and age, with the nearly limitless resources available via internet, it really is a matter of work ethic, more than anything else, when it comes to doing well on exams, and in life in general. And forming a plan of attack, and sticking to it, will get you through any difficulty---MCATS, USMLE, and Beyound. So why waste precious time panicking over the MCAT when it can be overcome with a mere 3-4 months of intense study? In the long run, that is not that bad, so have confidence!
It is innate, practice makes you better - only to a certain extent.
Let me revise my previous statement. I am sure that, for some people, the ability to overcome anxiety is innate. But most people have anxiety on some level, and many need to form a strategy to overcome it. I don't mean to be rude, but isn't it rather presumptuous of you to assume that your experiences with anxiety apply to everyone else? If you are just a naturally calm person, then good for you. Here's a gold star. But not everyone is like you. And a lot of people do just fine without this innate ability. There is nothing wrong with someone posting a question about how to deal with anxiety, and seeking the support of this forum. If, for you, practice only does so much, fine. But in my experience, and in many others, practice, will, and strategy can completely eradicate the negative impact test anxiety can have on a test taker. For you, practice may only work "to a certain extent." For others, well...we make it all the way.