How can PreUni cheat? Steal unreleased questions from the NSW Public School Association? That's impossible.
Therefore the success of PreUni can only be accredited to their professionalism in the preparation of materials and the accuracy in guessing the right style of questions.
LOL, memorising...
I agree with extra123, its very common to see ATARs been advertised by coaching colleges and obviously the student scores are updated yearly at Pre-Uni. Who would use the same student scores year by year, won't the public notice? If you go to Pre-Uni and actually look at the student's ATARs...