First, go here: http://www.terrypratchett.co.uk/forum/viewtopic.php?f=8&t=4189 and take the quiz. Post other questions like those on the quiz here. For example, here's an easy one:
Mary's father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. What is the name of the fifth daughter?