Authors Marina Braila and Konstantinos Oikonomou, published  7 Greek Advanced Workbooks, printable eBooks with Audio MP3file, for those who would like to improve their Greek at an advanced level, while learning more about Greece, Greek history, mythology, and not only…
(The same authors also wrote the known Intermediate  ” “Φύγαμε για Ελληνικά” Language book for the Intermediate levels.)