I am totally addicted to this latest style of Teach Yourself books. This series is aimed at those of us who have some knowledge of the language, but at the same time need to revise our grammar and vocabulary from the bottom up.
As can be seen here, each unit has clear goals in what you will be doing to improve in various areas of language learning. This structure is especially suitable for those of us who desire the structure and discipline that a classroom setting provides, but cannot spare the money for these types of courses.
This book can easily be found online or in bookstores. Below are some samples of what you’ll get in the book:
Polyglot in Progress 
