If you think that is worth or important you can follow your heart. Don't be worried about the result and prepare the exam carefully I know you have a little worried about the result.It doesn't matter. As long as you are prepare with your effort there is no any regret whatever the result is great or bad.
Don't think it too much. Before you worried about the result you need to take action rather than to think it again and again and make different result to hurt yourself.
We have been experienced a lot we also have lost many times while it also a great lesson for your grow up. Whatever happened it is great for you.