Thanks Pelihu for some insight. I will have 4 years of full-time work experience (including 3 month internship) by matriculation in 2008. Also, my undergrad GPA was 3.4. And you are right; my university was a non-brand-name university. And I am of Indian ethnicity (which I think wont help since there is a huge influx of Indians applying to B-school).
I came to US by myself when I was 15 and made my life here on my own (financially). After that, I went to support my sibling and parents. Therefore, I say that I have a 'unique' story. I could have gone to a brand- name school but from what I have seen, I feel that my education was at par, if not superior, to what they have to offer.
I have strong quantitative/analytical skills and therefore was attracted by Darden's rigorous case-study method. Stanford's focus on research and the stellar faculty are why I want to apply there.
Like I said before, I think standardized tests are worthless. But I will take your advice and give it another shot. I will put dedicated 3 weeks into it and then focus on my applications. I want to apply to these schools in R1
Any more suggestions would help. Thanks.