Well for any physical exams for any military you need to be fit enough to run 4-5 miles with out equipment but but people train with full gear but perhaps for airforce you won`t have to. You should be free of any infections/diseases. No medical history with blood pressure or heart problems
Most people collapse after 400 meters running which is may be 10% of running ability
Also you should be able to do pushups and lift weight with each hand I say about 3-4 kg per hand
For Intelligence , I suppose you are born with what you got , and you need to have solid clear rationalization , decision making skills instead of being confused. Intelligence is something you have in your head you got to be able to rationalize decisions as it saves lives
English well , you should have already finished English studies, there is not much that can be done about that unless you can communicate in english
Lastly you should not be afraid of heights ... if you plan to be a pilot for ground duties perhaps its not as important
All the best