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Purple Math On Complex Numbers
This site goes through 3 pages of explaining what complex numbers are and how you can manipulate them. This is a great tutorial and if you digest everything that is here then you should be fine for the exam.
This site is mostly examples but can help you see what the other tutorials are talking about. The site also has a complex number calculator which you can play with in order to get a better feel for complex numbers.
Well i can't say i share the same enthusiasm that this person has for complex numbers but they do an alright job explaining them. They also have some graphing of complex numbers. As far as I know you will not need to know about graphing complex numbers but it may help people understand them better.