MobileStudy is a useful flashcards app for studying material in question and answer format.

Learning can be done while on the go commuting on a bus, train, tram, etc conveniently on one hand.

Flashcards can be grouped according to subject and test topic. Additional related information can also be specified in extra fields.

Designed to aid learning of multiple sets of concise text.

http://appshopper.com/education/mobilestudy