UNC Chapel Hill Chances?

<p>I am currently a freshman at Appalachian State, and I am studying Pre-professional chemistry. I am looking to transfer to UNC because I believe I would be happier there, the academics are significantly better (albeit harder), and the Lineburger Cancer Center opportunities for undergraduate research. NCSU is my backup school. I was wondering what my chances are at UNC and NC State for sophomore year transfer?</p>

<p>College GPA: 3.81, Dean's List
1st Semester Grades: Chemistry 1101 (A), Biology 1801 (A), Chemistry 1101 Lab (A), Seminar class (A), Calculus I (B+). (15 hours)
2nd Semester Classes: Chemistry 1102, Chemistry 1102 Lab, Biology 1802, Calculus II, Intro to Psychology, and English 1000 (18 hours)</p>

<p>High School:
GPA: 2.87 UW, 3.7 W
SAT: 1990 (I retook it after college, my score before college was 1840)
AP Exams: Chemistry (3), Psychology (4), APUSH (4), Biology (3), US Government (3), English IV (3), and Macroeconomics (2).
I took challenging classes in high school, but my grades were middling. My worst semester (second semester Junior year) I took AP Psychology, APUSH, AP Chemistry, and Precalc and got CCCD, respectively. </p>

<p>Extracurriculars:
Boy Scouts: Eagle Scout, Bronze palm, 180 nights of camping, Senior Patrol Leader, Troop Guide, and Junior Assistant Scoutmaster
Cross Country: Ran all 4 years, captain senior year
Swimming: Swam all 4 years, Head captain senior year. Swim for the Appalachian club team
Chemistry club: Founded in high school, Historian in college
Health Professions club: Member in college
Lifeguard since freshman year
Own a lawn care company for 7 years and a photography business for 3.</p>

<p>I am in the process of writing my essay (2nd draft) and except for a few corrections, people really think it is good. I mentioned the Lineburger center and made sure that it is very personal and explains how UNC would be the best school for my major. I plan on getting a letter of recommendation from my Chemistry 1101 and 1102 professor who knows me very well, and my seminar professor who is the administrator for the Department of Health Sciences.
I am extremely worried about my high school performance, as I am transferring as a sophomore, how much will this bring me down? Also, does UNC allow for students to retake the SAT after being in college?</p>