Sometimes the school will ask you to reclass. My son went to an independent PK-9, so a lot of his classmates were applying to boarding schools. Two of the GLADCHEMS recommended re-classing to two different kids in my son’s grade.
One friend was admitted for 9th to one school but admitted to 10th at other schools. She decided to re-class and repeat 9th, as she was a legacy at that school and it was her top choice.
The other friend was told if he wanted to be competitive in his sport at that particular school, he should re-class. He went elsewhere without re-classing and was able to play varsity as a 9th grader at a smaller school.