: You can find comprehensive lists containing around 1,000 to 2,400 essential words needed to master the B1 level. Grammatik Aktiv
Many PDFs have a QR code or a link to MP3s.
: They provide extensive self-study resources up to B1 level that are highly recommended by the community on Reddit.
A good B1 PDF will just be a list of grammar rules—it will integrate all four skills (reading, writing, listening, speaking) through thematic chapters (e.g., Wohnen , Arbeit , Gesundheit , Reisen ).
Please note that some of these links may require registration or have limited availability. You can also try searching for these books on online libraries or purchasing them from bookstores.