First, you must ask the student what might happen if they do get a bad grade. If this "overly fearful" is fear of any sort of abuse (physical, emotional, neglectful, mental, etc.), then it is your job as a mandatory reporter to let someone else know. Even if it's just "if I fail a test, my mom will yell at me." No child deserves to be yelled at. Conversely, if the consequences of failing a test are mental (I won't be the perfect student anymore, I'm only worthy of _blank_ if I get good grades, etc.) that is something for the teacher, the guidance counselor, and the student's parents to help them with. Mental health for students (even as young as elementary) is very low right now, and that might be the root of this student's problems. As a last answer to your question, what can you do to help your student not be afraid of disappointing their parents if they fail? Tell them that their parents will love them no matter what the score. Let them know that YOU will care for them no matter what they achieve (that might be the most important thing they hear this year). You can tie in SEL and tell them that whatever score they get, their parent's reaction is their choice, not the student's.

Reassure the student that they are doing the best they can. Give the child praise when you are able to for the work they have completed. put notes on the paper about how well they are doing in case the parent sees. Let the child know that they are working hard and it is seen.

I would help students to develop a growth mindset so that they feel satisfied every time that they give their best shot in class. I would also work to make learning more enjoyable so that they may be less fearful of failure and parental disappointment.

Reassure this student. Help them destress and make your room a stress free zone.

I would give the student as much praise as possible and help the student re-gain confidence in themselves. You could even take it a step further by having parent teacher conferences to reassure the parents on how their child is doing and boost their confidence in their child as well.

I think positive reinforcement and positive affirmations would be great!