Is this a test that is possible to retake? If you really did fail this test, what are your consequences? Your parents are going to find out, sooner or later. It is always better to be up front and talk about this and explore your possible solutions. If your parents find out later and they find out you hid the results from them - oh yeah, they will be really upset, not so much that you failed but more so because you omitted the truth.
But then, I do not know your parents. I am only going on how I would react if this were my son. Good luck to you.
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