My teacher says it's 'risky' to do a French A level essay on the film (I have a choice between doing one on a book and one on a film) because the book gives you more detail. But, for revision purposes, the film (it is 'Au Revoir les Enfants' and it lasts about 1.5 hours) is easier to go through several times and easier to condense in my opinion. I would feel safer doing an essay on the film - is that acceptable? My teacher is basically forbidding me...but it is my choice?