求翻译：来到考场我非常紧张，虽然准备很充分，但心里还是害怕会考不好 ，因为老师说上音的考级是最严格的。是什么意思？

Came to the examination room I was so nervous while preparing very full, but the heart is afraid of examination is not good, because the teacher said on the sound of grading is the most strict.