(not in particular order)
creativity.
relevant work experience.
research experience.
confidence.
certain future plan.
quick and quantitative mind.
knowledge of world politics & finance.
common sense, IQ ,EQ and definitely AQ.
presentation skill.
writing skill and fluency in spoken eng.
awards, prizes and scholarship.
computer and programming skill.
maturity and professionalism.
with Eclipse , MATLAB and LaTeX
in my macbook makes me more like an MIT student. lol
impromptuz 
pretty much what everyone lacks