This website provides downloadable PDF cheat sheets for all grammar topics (cases, prepositions, tenses). It is a perfect supplement if you lack the main book.
This book breaks down each topic with tables, examples in both German and Serbian/Croatian, and practical exercises. Gramatika Savremenog Nemackog Jezika Pdf Downloadl
Remember: A grammar book without active practice is useless. Even the best PDF will not teach you German unless you write, speak, and make mistakes daily. This website provides downloadable PDF cheat sheets for