Where's cyprus? didn't they have miss universe hosted there like 2 years back? If they did, cyprus is very pretty.
MIT - pretty much a lottery draw. I'd say that you have a normal chance.. normal being, you are in the middle range - not a fantabulous candidate but not a dull/automatic reject either.
Plus, coming from an underrepresented country doesn't have a big impact as one might think. It wouldn't be called a 'hook' at all. It'd be something interesting that adcoms might slightly consider when looking at you. If you think you are one of the solid applicants from your country, you will have a ok/good chance at the prestige schools, eg mit.
you do have a good chance at MIT provided no one else applies from Cyprus.
What grade are you in? If you are in your senior year, it kinda sucks for you as you've only done 1 A level. Hope you are in grade 12..
DO you need fin aid? Prob not since you got your scholarship? (congrats btw). If you do need fin aid, it will affect your outcome in all schools except HYPM (williams). well, if you need fin aid, atleast you won't need a full one!