ICAO English minima !!!

[cap.hany]

hello all captains here, i am Hany from Egypt, 21 years old.just graduated from Egyptian Aviation Academy ( EAA ) Air Traffic Control and academic studies session.i am not yet a real ATC but i will ISA(by the God willing) soon.i did hear alot about ICAO English test before joining the real ATC field.i am taking now English courses to improve my language to pass that test.but really i don't know it's minima, how can i evaluate my self to ensure that i will pass?please i need some advices from such an experienced person like every body of you.how can i evaluate my English ?how can i improve my language better and better ?what are the most important subjects for the new ATC to have before joining the real life ? ( Aerodromes - Rules of the air -.... etc. )Thanks alot for reading even u don't know how to help