"Problems observed with the school culture"

So, unless I'm missing something, the move here is to better serve the students by replacing them?

A direct-run high school under the Recovery School District with scores near the bottom of the scale, Cohen had been slated for a gradual transition to governance by the New Orleans College Prep charter management group, with each graduating class of Cohen seniors being replaced by incoming College Prep freshman until the last direct-run class graduated in 2014. On Thursday, however, RSD officials announced that because of problems observed with the school culture, the Cohen juniors and seniors would be placed under the governance of Future Is Now for the remainder of the year, with most of the Cohen staff replaced.

Obviously that's not all that's going on.  There's also a healthy dose of, "When in doubt, fire some teachers" thrown in.