You don’t need examples of previous tests to prepare. Even if there was perfect enforcement of no recording devices, no corruption, no breaking in and stealing test papers people would talk about what the test was like, sitting to sitting. Some people retake the test multiple times. This would probably become normative in this case because the practice effect on IQ tests like the SAT is small but real. If people were really motivated you can just pay 100 people to do the test and get them to memorize parts of it, then stitch the parts together afterwards.