I need help on this movie !?

So ive been trying to look for a movie but i can not remember the name i need help !ill give a short description. there was a group of students and a

So i've been trying to look for a movie but i can not remember the name i need help !
ill give a short description. there was a group of students and a teacher, they basically went on adventures using their knowledge on how to get out of these hard situations. but in the end it was all an imagination. and i believe one of the characters in the movie was Benedict Cumberbatch.

or:So i've been trying to look for a movie but i can not remember the name i need help !ill give a short description. there was a group of students and a teacher, they basically went on adventures using their knowledge on how to get out of these hard situations. but in the end it was all an imagination. and i believe one of the characters in the movie was Benedict Cumberbatch.

or:Maybe its The Riot Club, or Starter for 10? Anyway, just look at a retrospective of films with Cumberbatch :)

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