Kay, so I'm not saying exams will help with mental health, but this guy may have somewhat of a point a. It's not a surprise at all that so many kids are struggling with depression nowadays, I mean, we've built such an ironic society it's disgusting.
Take a look at places children spend most of their time on now like instagram or snapchat... man... we've became so obsessed with idolizing this perfect lifestyle with all of these beautiful colours, amazing people and adventures everywhere, that perhaps somewhere between building a civilization where the only goal wasn't to survive and the media becoming what they are now, we've grown to be a bit too comfortable. And as a kid, you're at your most comfortable position in life, so naturally you hit a brick wall when you start getting your head around things. Even 10 years ago when I used to run around the estate people who were constantly sad were just weird, so it was better to not be one of them in the first place. Nowadays depression's swinging between being normal and popular, along with people becoming too expecting, too emotional, too feminized.
People who's existence is endangered don't have existential crisis problems. We've gone way too soft, but the thing is, the nature of life hasn't. Maybe more exam preparation before GCSEs would help with the stress of GCSEs? Maybe that could slightly help with the well-being of the society, don't know.