You shouldn't forge someone's signature.
Delia is student who has recently failed her biology test, and needs to get it signed by her parents.
Delia wants to avoid getting in trouble.
Delia apologizes to her parents about her failed test and promises to study harder for future tests.
Delia signs her mom's name on her failed test and returns it to her biology teacher.
Delia's parents hold her to her word, and she improves her grades.
Delia's biology teacher calls her mom to discuss the failed test, and grounds Delia when she discovers what happened.