When I was in middle school, first two years boys and girl were separated in class. And school policy has changed to boys and girls mixed. At that time, those changes have left many excitement and nervousness.

Usually, after physical training, boys did not take shower. And this behavior bad smell imposed class room. However, boys do high hygienically clean themselves after they share class room with girls.

Finally, not only boys start to clean themselves, they also want to show their enthusiasm toward their grade. I do believe mixed boys and girl class room help them to look after themselves and their interest .