thanks for answers
trust me gasoline in iran is more expensive than other countries but its not the problem in iran there is no flight school except 2 3 of them which has only 5 airplain to train students and its not good for hour bulding.
about english you completly right but i can get my Ielts 7 during my course.
how about air charters and air taxing ? are they good for hour bulid ? do i need f-1 visa for them too ?