Before you show it to your parents, you might say: Your son has two pieces of news for you today, one is bad news and the other is good news. Which news do you want to hear first? Whatever they say, you must tell them the bad news first. You said, I first said that the bad news is that my grades are not very good, and then I said that the good news is that I really faced it, and I won't hide it from you. I feel guilty, too Please give me a chance. I will study hard from now on, and I will make progress next time.

Your test this time should be worse than your real score. Play normally next time and do better than this time. Don't you think this is a small step forward?

In other words, you are embarrassed to do so badly in the exam. Try harder and do better in the exam next time, ok?