Well, in the last day or two I found a couple of more resources in other CC threads:
If doing something on your own this summer is too daunting, consider harmonizing with high-achieving students who have been dreaming of elite admissions for years, and take some classes on the process, etc. Do this by applying to the summer programs offered at Phillips Academy and Phillips Exeter Academy. According to another poster, they give generous scholarships (free? IDK). Their programs consist of academic and athletic subjects with students, some of whom are likely ivy-bound; as well as meetings with admissions staff and visits to ivy lineage colleges. This will get you in the proper mindset, be fun, and you may even learn a thing or two.
The application period is open. Get your application in by Valentine’s day, or you may miss the boat!
And, can you get into Yale? Here is an article from the recent issue of Yale’s magazine, with generous quotes from Yale’s president:
http://www.yalealumnimagazine.com/articles/3801/wanted-smart-students-from-poor-families