Depending on what kind of student you are but during my time, I heavily use these sources and apps apart from the revision sets
- https://evernote.com/ : I use this app to label my notes and store web clips
- Astro Channels
- Sparknotes for literature : https://www.sparknotes.com/lit/crusoe/
- Course Crash : https://www.youtube.com/watch?v=Z3Wvw6BivVI
What other materials are you guys using?