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Do any of you know of any good payment systems or secured transactions study aids? I'm looking for stuff that has practice essay problems (but multiple choice also works). I've had mixed opinions when using Q and A and Examples and Explanations...When I've used them for previous classes, they seemed to be too easy to really be helpful in some subjects.

I just want something that I can use to practice over thanksgiving break. I'm going back home and obviously won't have access to the school library. Any suggestions?