I enjoy teaching people, and I teach people how to program. I'm close to doing my GCSE's and for revising I was thinking of making tutorials and storing them on my computer, therefore I can see whether I understand the topic and review the footage at a later date.
I think it sounds like a great way to revise. Anything that makes you break down a subject in this way is helpful - you're basically describing a more engaged version of making revision notes. Creating the tutorials in the first place will help you remember things - reviewing later will help it stick. And if you're feeling altruistic - share the tutorials with the rest of us on TSR!