My very mature kid, who was turning 14 the summer before 9th grade, was waitlisted at every BS he applied to and it was suggested they reapply as a repeat 9th grader. They’re now thriving at a HADES school as a 16 year old 10th grader. Even though they have always been mature, it was amazing the difference that year made and I give credit to the AOs for realizing this.
Because of this experience, our younger kid who also has a summer BD is currently attending 9th grade at our LPS and applying as a repeat 9th grader for next year.