A quiz is a bad way of going about it. Have a necklace that needs to be found. The necklace belonged to an importan historical figure. In trying to get the necklace they learn about the person who owned it how he made it and why. Don't say you have to finish your home work before you can play.
I would make the quest you are trying to help one of your teachers. It is an extra credit assignment. You must find the necklace. There are a number of people who can give you information on said necklace if you help them. One boy wants you to find a rare flower in a historically imporant garden. One girl wants you to discover why all the birds left her meadow and the answer has to do with the world's history. Once you know all of the important details you can get the necklace pass the class and get into the guild.