I make lots of notes. Lots and lots of notes. When I was studying for the v4, these were all written down by hand. The notes would become torn, covered in something or other, lost or filed somewhere, never to be seen again.
Just recently Microsoft have released OneNote for the Mac, as well as iOS and kindle. So now I have the same set of notes on my work laptop, which is Windows, my laptop and desktop at home, both of which run OSX, my iPhone and my Kindle.
Now I have the same set of notes on every device I use. These are separated into topic, and synced so edits made at work are ready and waiting for me at home.
OneNote is also free. It can be downloaded from www.onenote.com.
What is your favourite resource for studying?