In school most study documents will come in a pdf format or a PowerPoint presentation. There are a lot of platforms where you can get these kinds of study materials.
A few of which include:
1. Pdf drive (https://pdfdrive.com): This website contains documents in PDF format on all kinds of topics that are beneficial to students at all levels.
2. Slides hare (https://slideshare.net): This website contain documents in PowerPoint (ppt) format. If you have any slides for a presentation check this website. You can download the ppt from this website for your own use.
3. Google books (https://https://books.google.com/): This is a repository of books from which you can get all sort of information.

Other sources that you can use include:
1. https://studydrive.net
2. https://studocu.com
3. https://osmosis.org
4. https://khanacademy.org