It's bad to repeat a grade multiple times.
Luna is struggling in school and has already repeated her junior year because of bad grades.
Luna wants to catch up in school.
Luna decides to sign up for summer school during her summer break.
Luna decides to repeat the grade another time in order to learn the material.
Luna's peers think she has made a responsible decision and is becoming mature.
Luna's peers develop a bad opinion of her due to her being stuck in 11th grade.