They may ask the reason for the retake, and you should be honest. If it's personal, you can make general allusions: " family problems, " or " a difficult personal period.
[header] How to convince a teacher to let you retake a test [title] Decide what it is that caused you to fail the test. [step] Did you not study? Did you get in a fight with your parents? [substeps] Understanding why you failed can help you prepare for a retake. Think about how much of this information you're willing to share with your teacher.