Usphs Srcostep

Hello all I have been closely following most of the USPHS service threads and if I ask anything that has already been answered please forgive me. I am a junior and I am working on my packet to get it finished up and mailed in in the next few weeks. I have not been able to get in touch with any recruiters through phone calls or e-mails so some of my questions may be very simple. So, my first question is, is there any additional documents that I need to send in that is not listed on the USPHS website as requirements for the SRCOSTEP packet. What are the odds of being accepted pending you have 4 good references and good grades (3.0 or above on a 4.0 scale)? If accepted how likely is it to get an offer from an specific agency that you listed in your packet as a prefered agency? If you put a preference on the location how likely are you to get that as well? I am very interested in mental health what if anything should I put on my application packet to help get me into a career for mental health? I am very leary of indian health because I have heard that a lot of indian reservations can be dangeous places for cacasion's has any USPHS memebers found this to be true? What health conditions are considered automatic disqualification and is it the same a regular military service health qualifications? Okay thats all I can think of at this time and if anyone knows any of these answers that would be great. Thank you all in advance.