UNIVERSITY OF CAMBRIDGE ESOL 

                 http://www.cambridgeesol.org/

Hellenic British Union 

                  http://www.hbu.gr/

(G.M.AT)

                www.mba.com/mba/TaketheGMAT

(T.O.E.F.L)

                www.ets.org

Common European Framework

                www.coe.int/T/DG4/Linguistic/CADRE_EN.asp

(ALTE)

                www.alte.org