Study to be a 100% teacher.
No matter how good of a teacher you are, some of your information transfered to the student will be lost.
If you attempt to be an 80% teacher of knowledge, your students will end up - on best - with only 60% of that knowledge.
If you attempt to give it all 100%, your students will end up closer to the 80-85% range if not more.
So in the end, your written scores don't meant #### to anyone but you. Just study hard, and go and take it. Make sure you pass.