I disagree with the other reviewer. Perhaps the problem is the title of this book. "Basic Polish" in big letters, but beneath this, a grammar and workbook in small letters - which is what the book is actually about.
It won't teach you Polish, only how the cases are applied, through multiple examples. It is the repetitiveness of the examples that generates the benefits. This book is probably geared at someone with more than around 20-30 hours polish lessons behind them. At this point, basic words cease to be as useful as they were and you're looking to construct sentences. Probably, your teacher will have introduced you to some basic cases like the accusative or the locative, which may confuse you as there are some many different declinations even within the same case. however, this is when the book becomes very useful.
It also helps reinforce your vocabulary, because new words are repeated in later later chapters and there's a basic dictionary at the back (polish - english only).
So, not a first choice book for a learner as it's dry material. Instead, try ordering Hurra po polsku. However, this is a useful companion as and when your teacher introduces each new case.