Decision tree and triggering course completion

At the tail end of my course, which is pretty linear at this point, the student needs to select 1 of 2 or 3 devices they need training on. They can only select one.  So each device section will have 2-3 slides instructional slides.  I would like to have a device specific final exam, but then how would I trigger the completion status?  Can't trigger on number of slides viewed or on the exam taken.  I thought there was a way to trigger when they view a final slide....perhaps an exit course slide, but I don't see that as an option.