I got on board this summer with an amazing website called http://www.myivyedge.com. The essence of the website is that current college students, like myself, at top universities (not limited to, but including the Ivies) instruct applicants in order that they submit the best possible application. Possible services include interview preparation, essay revisions, ACT prep, and so on. If you want to test out the service, there is a free 20-minute consultation on the site, and when you purchase (if you do) you can use my code D1269 for 10% off your entire purchase.
Try the free consultation and let me know what you think!