How to learn ICAO English?
ICAO recommends that an approximate scope of language proficiency training needed to get from one level to another is 400 hours of combination of various means of the training.
As flight school cannot make you a pilot over the weekend, Aero Language cannot make you an English expert within short time. Evening course of English language proficiency training won't make you perfectly proficient. English language training and especially aviation English training doesn't take days, or months. It takes a years.
Aero Language proposes combination of comprehensive English language course together with aviation-specific English language proficiency training course.