[quote=@Prince of Seraphs]
<Snipped quote by McFazzer>
...someone who mentioned they failed there entrance exam...
[/quote]

In fairness, this isn't a secret. All of BAST failed the exam. They got in by virtue of unofficial conduct, and even that was pretty contentious between Ozpin and Goodwitch from the look of it. It's not that it's secret, it's just that no one really knows because it just happened.

Staff (as noted by Port) know and while the students haven't been told, it's pretty easy to guess that there's something up there. A whole team of freshmen, none of whom were present at or mentioned in the team announcement ceremeony/event/whatever you wish to call it? The exact truth isn't known, but a little thought and a few questions would turn up that particular fact without much effort.