Question Banks Help Needed

Good day

I am creating a quiz that has four question banks with 4 questions inside each question bank. Each question bank is based on a case study with 4 questions following what one would have just read. However when students are completing this assessment we need one of the four questions banks to appear and not the questions within the question banks randomised, is this possible to do and how do i go about it? 

Really hope this makes sense.