| Resource | Format | Best for | | :--- | :--- | :--- | | | Official PDF via library apps | Structured grammar and DELF prep | | Alter Ego 4+ (Hachette) | Scanned PDFs widely available | Older, but very thorough culture | | Cosmopolite 4 (Hachette) | Digital ebook via publisher | Modern design and video content | | Grammaire Progressive du Français B2/B2 | Official PDF (purchase) | Mastering grammar systematically |