Here are some good links to help you study and for further information.
Here's a fun source for information on countries of the world. World Maps
Great for Map Tests! World Geography study aide - take a quiz and see what you know (and don't know!). I Like 2 Learn Geography quiz
Japan: Prince Shotoku's Seventeen Article Constitution http://info.teachtci.com/resources/ha/MWH/primarysources/MWH_U5Primary.aspx
Interested in the Crusades? This site will give you more details. http://www.nmhtthornton.com/mehistorydatabase/crusades.php