As French man we used to watching movie like this in france especially in sector of school and this movie it's pretty much good and enough chilling anyway thanks to a lot of points !
The script it's very nice even if I expected better about the end of movie but in all the movie it's great, several times I was chilling in front several scenes and I felt sorry for some of the characters on some situations, it's very a movie when they gonna telling story that you remember not long time but it is so emotional a lot, not a masterpiece but a good story that happened by a real guy unfortunately cause it's based on a true story !!! It's crazy but it's happen
First to all the acting are so nice, the main character play by Francois Civil was great and the French actor that I appreciate a lot played his role very well and this kind of performance for me to winning an César (Alternative of an Oscar in France) cause play a role like this that he got to give several different deep emotion it's not easy to play, it's not beautiful performance ever neither but it's very good performance!!!
And the rest of cast like others teachers, students... play very well too especially character of " Leslie " she played very great !!!
The directing was well, not very good or great cause I think he could do better to telling the story even if it was not bad, not at all but he could makes better about a lot of shoots to explain and telling a specifically moment of movie, disappointing a bit ...
Not big soundtracks too bad but lights playing very well !!!