I had a blog back in my college days that I was actually active writing on in between school and work. I used it to write about life in school, technology, programming, etc. and also posted materials related to school homework and such. The link can be found at daily life of the Menace. Please check it out!
I loved the idea of collecting cheat sheets and sharing it with my fellow mates and even started a Google Group (specifically for MIS 150 class) for people to upload/download homework and exam materials. It was an invite only and it didn't take very long until the word got out and everyone wanted to be invited. It was great and after I graduated, students from the next semester (and years after) also found out about it, and requested an invitation.
It grew to hundreds of members and it was kept active by a few and I have long moved on by then. There were literally over a hundred of documents from different semesters with different questionnaires.
Unfortunately, Google upgraded the Google Groups to a new version which I found out much later. This resulted of the files being deleted and unrecoverable. I was upset as those files could have helped future students. Fortunately, I was also blogging about my own materials separately which allowed me to recover some of these "protected" files from my old site. Ironically enough, I also dedicated to upload them in Google Drive lol. So here it is and you can help others by pointing them here. Good luck!