nepali applicant chances?

<p>my stats are as follows:
sat 1 verbal: 720 sat 1 math: 800
sat 2 math2c: 790 sat 2 physics: 800 sat 2 writing: 590
sat 2 writing and chemistry re-taken on nov.
my a level results are:
physics-A Chemistry-A math-A
Further mathematics-A General Paper-b
economics-a business studies-b
TOEFL 280 (essay rating 5)
further math, eco and business studies are my self prepared subs.
how much will my low writing score affect my admission?
i am from nepal so will being from a third world country help me get in?
plz help</p>