But you can re-take the Dodex test. After you've had a chance to consider the questions and answers more, you might decide that you answered some questions too hastily. You might change your mind about some things. Take the test again, and see what results you get. Or stick with the sign the test gave you and see how you like it.
Some people take the test once and figure whatever sign it says they are, that's what sign they are.
But it's all up to you. Of course not. As you change, you're free to take the test again. But you should also remember that your Dodex sign is not your destiny. You could be any sign and still be suited for, well, anything.