Below we provide you the link to the webpages where you can find the official mathematics curricula (in Greek language) at the primary and middle level of instruction in Greece.
http://www.pi-schools.gr/download/programs/depps/11deppsaps_math.zip
Due to the fact that the official mathematics curricula of high school are not online, you can find the corresponding documents for each grade of high school here (in Greek language):
Also, below we provide the link to the english version of the Crossthematic Curriculum Framework for Mathematics at the primary, and middle school level.
http://www.pi-schools.gr/download/programs/depps/english/12th.pdf
Georgios M. Dimakos
ICMI Representative for Greece