| Type of Content | Reliability | Quality | |----------------|-------------|---------| | PDF scans of the book | Medium | Variable (some poor resolution, missing pages) | | MP3 audio files | Medium | Often incomplete or mislabeled | | Links to external file hosts (Yandex.Disk, Mega, Google Drive) | Low risk of malware | Hit or miss | | VK user groups dedicated to DELF prep | High for community help, but files may be removed |