This really seems like a terrible environment for learning. You can't learn as well under stress; it's just setting the slower kids up for failure since they'll start performing even worse and worse. Even the smarter kids would be under a ton of stress and would have a much higher chance of developing depression and other mental illnesses. Not to mention how unethical this is and how their families would be up-in-arms over it if they found out. And the United Nations would even probably do something if news got out.
@gordon17 It's public shaming. They're being forced to reveal more of their body than they are comfortable with to the entire school, which is also likely to lead to bullying and harrassment either because they're too ugly/fat or they're too sexy.