If the exam is not very important, you can be rude to your parents for a while. You can imitate your parents' signatures yourself, and now practice it several times on the draft paper (don't be found! ) I learned it quickly, and then I copied a piece of paper with a pen of other colors, which should be invisible. If parents ask about the exam, you can prevaricate with other papers. Things are almost ready this time!

If it is a very important exam, show it to your parents for the sake of doing well in your next exam! Find the reason together. Tell them the truth, they won't scold you.