Djimmakos, I have seen your question about the verification of Cpe. well, there are two ways to do so:
1) the british council can provide you with valid copies of your document(valid up to 3 months). Or,
2) Along with a photocopy of your document, you should submit an "υπεύθυνη δήλωση" ,(you can find this form at a Κ.Ε.Π.), verifying that:
"το έγγραφο που επισυνάπτω αποτελεί γνήσιο αντίγραφο εκ του πρωτοτύπου που έχω στα χέρια μου"(valid up to 3 months, as well). This must be validated , with your signature and identity card, at a Κ.Ε.Π.(=κέντρο εξυπηρέτησης πολιτών)
-Either way, you must, definitely, have a photocopy of the official translation of the document (provided by a lawyer or by the translation department of our ministry of foreign affairs.) This translation must be validated at a Κ.Ε.Π. as well.