World cinema has never been short of films about alienated teenagers, but it’s extremely rare to find one so consistently well-observed as School Trip, an enormously promising debut from director Winckler, who co-wrote the script with Stefan Kriekhaus. Their sympathetic understanding of the rhythms and details of adolescent life recalls Lukas Moodysson’s Fucking Amal – School Trip is very strong on the children’s sudden jealousies and friendships, the harsh insider/outsider dynamics of teenage cliques, their self-contained worlds designed to shut out blundering adults – the teacher “in charge” is a spectacularly ineffectual, peripheral, pretty much irrelevant figure.