I'd recommend you write down all you know about a topic down in a big piece of paper. Once that's done, fill in what you did not include. If you're feeling ambitious, you can even add on Case Studies to memorise.
This solidifies the basic knowledge part, where when you think of one topic, your brain internally links it to a few other key words!
I find that this skill is exactly what you need for an 8 marker!
Tip that I always seem to miss: If they give you statistics, reference them!! Those are the easiest marks you can get!