Don’t worry. Your ‘grade’ on the test, does not affect your salvation or graduation into the kingdom. You can’t earn you way to graduation, no matter how hard you study or what you do. Salvation is not based on how many ‘right’ answers you get. Salvation is based upon a few, short simple statements of faith you make directly with the Head Master or Head School teacher of the Universe.
Good luck studying! The Head Master is curious to see how well you study.