Extract vocabulary from each lesson into a flashcard app (Anki or Quizlet). Review daily. The "extra quality" PDF often includes a pre-made vocabulary list for this purpose.

In PDF sharing or download circles, “extra quality” usually implies:

However, be cautious: “extra quality” is not an official designation by the publisher. It’s user-generated terminology often found on file-sharing sites, forums, or Telegram channels.

An extra quality PDF wouldn't just list "Un caffè, per favore." It would include: