Luxair_ca
GCSE is the British standard of secondary education. So whatever is your secondary level of education in your home country is what they are after.
As for employing Male FA's, they do. I'm am not sure if they are currently recruiting Male FA's, so apply anyway, and at least you will get the correct answer from them.
Employment with Emirates is ongoing. They like to keep their quota's of nationalities at certain levels, so your application would also be dependant on what they currently need.
Good Luck.........
AOG007