I saw this movie in the early 90’s on tv.  I think the setting was in Australia.  The movie started in a single room school house in the outback when some thugs came and took them and led them to find something.  It  goes through their adventure of the school children of varying ages and their female teacher taking care of each other, surviving, aluding their captors and overcoming them.  I remember the final scene back in the school house with a body part in a glass container.  I loved the survival aspect of it and how they worked together.  I wish I could see it again.