I have recently published a book called: "The Big Bad World of Concept Art for Video Games: An Insider's Guide for Students" geared towards helping students prepare for a career in concept art. In the book, I cover in great detail what the job of a concept artist really entails, how to choose the right education, what you should be studying and practicing in school, how to properly build your portfolio, and much much more.
More info here: http://bigbadworldofconceptart.com/buy/