Sharing material is risky, if say a student found out one of their peers had an advantage, they may 'raise the alarm' which leads to investigation etc. etc. etc. Unlikely you will be caught, but not worth it. The University also has people sometimes read these forums or look to see if there is sharing elsewhere, so I suggest that no one does it. I suspect it's why they change a few things around every year such as the practicals and the lecture material content for some of the parts - well at least for biology, they only give out one practice exam because they don't want a billion emails about things off the course because it was on a practice exam, and they also change the practicals every year as I have heard. It's also not fair on those who get the material as opposed to those who don't, and of course there are copyright issues. You were of course intending under good faith, and are an extremely helpful, intelligent member on these forums, and have not undertaken the idea to my understanding, so there has nothing here that was done wrong.