Reading over the Camden statistics, it makes it pretty clear that Camden's demographics are the perfect explanation for the crime rate - it has the lowest education rate and the highest unemployment rate for youth under 25. Those are the basic problems that need to be fixed - get the kids in school, off the street, and a productive job when they graduate. What a shame.
Back on topic, to the original poster, I'd find a single theme to your portfolio, and concentrate on that theme. Twenty images that show your ability to think about a topic, analyze it, and say something about it in a coherent manner will be far more impressive to a college admissions panel than 20 disconnected slides of otherwise well-made photographs. I've been dealing with this same issue, on a different level, with applying to graduate schools for an MFA in photography program. Fun stuff, but really challenging. I haven't had to think or focus this hard on something in over fifteen years.