Haha..seriosuly,the GMAT exam is a big pain for most people.Ofcourse, you may belong to the non-pain category. Give it a shot if you have time. May be you will score a 700 or higher. If that happens then you don't need to worry because it is a GREAT score and virtually any school in the world will accpet you. Now, lets say you score lower,much lower than what you plan, then give your self a break and study again!
BY the way, scores are valid for only 5 years. So if you plan to apply to business school after that period then you will anyway have to take the test again.