I've been to North Africa, but not Morocco. I loved every minute of it but it was very different, and even though I tried very hard I still made a couple of fuck ups, culturally. I think the fact French is spoken makes it seem like it's familiar, when it's really not.
I would be worried, a group of school kids may very well be inappropriate in a foreign culture without realising it. They may even get in serious trouble. You can tell teens till you're blue in the face but they don't listen/forget/think they know better.
With the best will in the world a school trip isn't going to be able to monitor what they're doing like a family going away would be able to.
I'm thinking about their dress - could they all be relied on to dress in a way that won't cause a reaction? Arms and legs always covered even though it's hot?
How about how they interact? Is it a mixed sex school? Will the boys and girls inadvertently do something considered scandalous just by behaving how they normally would? I'm thinking a boy putting his arm round a girl, or silly playing / tickling / touching type behaviour that was certainly common when I was that age.
Are any of the kids gay? That's illegal. Are any of them in a relationship - either gay or straight? That could cause a problem if there's and kind of PDA.
Might they swear? Might they feel that the cultural rules above are wrong, and should be challenged? Teens have a tendency to act first and think later - not a great combination.
I found something as simple as making eye contact with male shopkeepers (which I would do without even realising) invited them to be very intense, almost aggressive in trying to get me to buy something. Sometimes they physically grabbed my arm and led me into the shop. A teen girl being dragged into a shop is going to be scared, and not know what to do.
By not behaving as a native female would, I found I seemed to move into a 3rd category where you're not treated as a native female would be treated. But you're also not treated with the respect a man would be. It's quite disconcerting.
Doing something that makes you seem 'not respectable' can tip into 'not respected' quite easily. Being perceived as 'not respectable', especially for girls, by the wrong person could be disastrous.