Just to clarify few things for you.....
Emirates take only their nationals into so called cadet program. These guys and girls are than trained by the Emirates Airlines from the very beginning until they are ready to fly as co-pilots. Since this program is sponsored by the airline ( students don't pay anything apart from signing a bond) it's normal that its only opened for UAE nationals.
Saying this, any other nationality is more that welcome to join the company. However to join Emirates you must have required experience ( flying hours ). To get those flying hours required to apply you will have to fly for at least 3 years somewhere else ( considering you are lucky enough to get a job on big jets straight after your flying school which is extremely difficult ).
This is the situation at the moment. By the time you finish your high school and flight training things in aviation can change....for better or for worse.
To become a pilot you don't have to be super smart or to be math expert, but hardworking and determined. Airline industry is tough and the easiest part is the actual flight training.
I would recommend you keep math and physics as your subjects till the end of high school if you can, not because you gonna need that knowledge necessarily but sometimes there are international airlines that open their cadet programs for foreigners and usually they require high grades from those subjects.
Good luck