Repeating a Grade at a Prep-School?

@paveyourpath This is what I found on the 2013 Common App:

List all other secondary schools you have attended since 9th grade, including academic summer schools or enrichment programs hosted on a secondary school campus:
School Name, CEEB/ACT Code, Location (City, State/Province, ZIP/Postal Code, Country), Dates Attended (mm/yyyy)

Which 9th grade- the 1st 9th grade experience or the second 9th grade experience? If one chooses from the second 9th grade experience, and includes all summer coursework, I believe it would fulfill the request. I suppose the revised Common App might be more specific, but there looks to be wiggle room in interpretation here. I am certain many people in 2013 chose not to reveal their first experience with 9th grade. Having said that, depending on when one’s birthday is located in the calendar year, it might behoove one to be forthcoming…even perhaps write an essay about it.