Level a
A 1: France, Denmark, Croatia, Austria.
A2: Spain, Portugal, Switzerland, Czech Republic.
A3: Italy, Germany, Britain, Hungary.
A4: Belgium, Netherlands, Poland and Wales.
b grade
B 1: Ukraine, Scotland, Ireland, Armenia.
B2: Iceland, Russia, Israel, Albania.
B3: Bosnia and Herzegovina, Finland, Romania and Montenegro.
B4: Sweden, Norway, Serbia and Slovenia.
Class c
C 1: Turkey, Luxembourg, Lithuania, Faroe Islands.
C2: Northern Ireland, Greece, Kosovo, Cyprus and Estonia.
C3: Slovakia, Belarus, Azerbaijan, Kazakhstan and Moldova.
C4: Bulgaria, northern Macedonia, Georgia, Gibraltar.
Class d
D 1: Cyprus and Estonia, Liechtenstein, Latvia and Andorra.
D2: Kazakhstan and Moldova, Malta and San Marino.