When I was in nursing school, we were simply given the case study- A short synopsis about the patient with pertinent assessment data, lab results, MAR, etc. Then we had a list of questions to answer about the case study. The case studies were either written by the teacher or (more commonly) taken from an online resource database that the instructor had access to.
As students, we weren't given any additional information, but were expected to use our available resources (text books, internet) in order to answer the questions. Also, case studies were given as part of our lecture/theory classes, not clinicals. Our clinical instructors were responsible for grading our care plans each week and overseeing our clinical practice. They did not give any work unrelated to the patients we were assigned each week.