First of all, don’t panic! Many people, if not most people, bomb the practice tests. It’s just practice. It’s not the real thing. It can be very valuable, if you stay in learning mode.
The key now is to learn as much as possible from the experience. Pay attention to which sub topics you struggled with. Notice when you answered several questions in a row incorrectly and see whether it was a lapse in focus, or if you let a difficult question break your confidence and infect the next several questions.
Make note of how you felt at different parts during the day. What distracted you? When did you get hungry or tired?
This score is not dispositive. Keep studying and stay focused on learning. Your score will improve significantly from now until exam day as you learn more, memorize more, and practice more. You’re not in exam mode until the day of the exam.
To get the most out of your post-exam review, you may want to review your score and study strategy with the bar support folks at your school.