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I have been learning German across different platforms and from different sources. I bought this book to help with the grammar. I was disappointed. The explanations bounce between short and vague or over kill. Page 1 gives us 20 rules to understand the gender of the noun. Too much, too soon.
The drills don't relate to the explanations given a few pages before. They also seem a little random.
The book says "perfect for beginning and intermediate learners". If you are a beginner I would stay away.