This is the simplest thing in the world and should be possible--but I don't see an answer. I want to create 3 (or 4 or 5) versions of a complete test. Each version of the test will have, say 25 questions. I want to assign the 3 versions randomly to my students. 

I don't want each question independently randomized. I don't want 25 question banks with 3 versions of each question because some of the questions will be stimulus/question blocks with multiple questions tied to a stimulus. I just want the entire test delivered randomly.