I've recently been writing some one-page revision notes for my AS Philosophy students (based around the OCR specification). They are included here for the reference of anyone who might find them useful!
- Plato on a Page (1793)
- Aristotle on A4 (1391)
- Design Argument Digest (1318)
- Ontological Argument Overview (1486)
- Cosmological Argument Condensed (1299)
- Creator God Compendium (1228)
- Moral Argument in a Minute (2004)
- God as Praiseworthy Precis (1011)
- Augustinian Theodicy Abridged (1057)
- Instant Irenaeus (1112)
- Religion and Science Reduced (1330)
- Big Bang Briefly (934)
- Origins of Humanity in Outline (911)
You might also find AS Past Questions by Year and Topic (1123) useful.
There are also lots of useful videos outlining key topics from Philosvids.