If you would like to take the G2 road test after your G1 (Knowledge test), you will need an ATIO certified translation of your valid driver’s license. If you would like to skip G2 and take the full G road test, you will also need an ATIO certified translation of your authorization letter (also known as history letter). The letter must not be more than 6 months old.
Here are two sample authorization letters issued in Iran.
English (Canada) 
فارسی