I suppose it's considered a Palestinian movie, although the credits give the impression that the impetus and funding is British.
There are three main characters: the eponymous high-school teacher, his teenage student Adam who's a neighbor in his village, and a young British woman who's a kind of social worker colleague at the school. I'm trying to figure out what to post without revealing any of the surprises. Basically, it's a grim view of the tensions with Israelis, with the Palestinians constantly harassed and yearning for revenge. The teacher, played by Saleh Bakri (a prominent Palestinian actor, though unknown to me), is the calming rational influence for the more hot-headed boys. It takes a while for the plot to become apparent, but there are a lot of good twists, and each of the three shows remarkable courage.
Apart from everything else, I think everyone should see movies like this because they show us a totally different life than our own. In this case, with a bunch of sub-plots, several different lives. Oh, and I discovered after the fact that the director is a woman - not surprising because it's a very intimate film.
I hope people go - preferably going as unknowing as I was, with no prior knowledge.