I will suggest you to start preparing again and don't get disheartened by your performance. It is the most crucial time for you and this is where you will make the most important decision of your life. If you Don't know what to do then why have you come so far! Discipline yourself right now. Don't let the fear of losing, grab hold of you. You know you deserve more then why not try more. We all fail in life at some point, it's how you get past that and start working hard at your next goal.