Schaum's Outline of Mathematica, Third Edition

Fortunately, there-s Schaum-s. 

More than 40 million students have trusted Schaum-s to help them succeed in the classroom and on exams. Schaum-s is the key to faster learning and higher grades in every subject. Each Outline presents all the essential course information in an easy-to-follow, topic-by-topic format. You also get hundreds of examples, sovled problems, and practice exercises to test your skills. 

-  750 exercises with answers

-  Introduction to the most widely used language in technical and scientific computing

-  Reference index of the most useful commands in Mathematica

- Support for all major textbooks for courses in Mathematica