I nerely got an F- on my test. My teacher said she can't believe it after all the things she half me

I'm sorry to hear that. It can be disheartening to receive a low grade, especially when your teacher had high expectations for you. It's possible that there may have been a misunderstanding or a gap in your understanding of the material. It's essential to communicate with your teacher and ask for clarification on where you went wrong and how you can improve. Take this as an opportunity to learn from your mistakes and work towards better grades in the future. Keep studying and seeking help when needed, and remember that one grade does not define your abilities.