There are a number of excellent sites that will help you should you need an alternative source of information other than your course text. Here are a few that are worth adding to your favourites / bookmarks.
A must for all economics students. Subscribe to the blog for regular updates related to your course. They provide a wealth of resources in the lead up to examinations.
Site dedicated to providing theory accessible to A Level and IB students.
Another site that covers almost all topics related to your course. The author also writes a very accessible blog and responds to readers questions.
Video lessons covering every topic of the IB Economics course.
Great for definitions. Every key term you will ever need. Use this site to create a revision quiz using Quizlet
Current and historic macroeconomic data for a large number of different countries.
Contains economic profiles for every single country in the world.
Economic ideas worth spreading.