General question on scores... Please answer to calm my nerves

<p>Ok so this past January, I got a 800 M 640 R 760 W. I really want to get into a top university, like Duke, U of Michigan, UVA, maybe Cornell, Colgate, etc...</p>

<p>I know scores are not the only thing in the world, but I am registered for the test this coming Saturday and I have not been practicing. The reason for this is that I was quite happy with my 2200 and had a "don't care" additude, which I know isn't a good thing.</p>

<p>Now, I am sort of freaking out because 640 R is quite low... Reading is very hard for me and I was never too sure about the section in general.</p>

<p>Here come(s) my question(s)...
1. Should I just wing it for this Saturday?
2. If I do poorly, will colleges see this?
3. If I excel in reading and go down in the other two sections, should i send both scores?
4. Will it look bad if I only send one SAT score?
5. Is a 640 a big dump on my shot at top univs?</p>

<p>Replies appreciated a ton.</p>