Admin Coaching is a program designed to match experienced users with administrator hopefuls for one-on-one coaching. The experienced users, being better versed in the qualities expected of a prospective admin, help the hopefuls learn the ways of Wikipedia.
This program is designed for people who have figured out the basics of editing articles; they're not newcomers any more, but they might want some help in learning new roles. Some might like suggestions about how to learn vandal patrol, or mentoring on taking an article to featured status, or guidance with a proposal they plan to make at the Village Pump, for example.
Admin Coaching does not guarantee that you will pass RfA nor is it necessary. Ultimately, this is your responsibility, not the responsibility of your coach. A coach may teach you the ropes, but what you do with the ropes is up to you. Good luck!
Read more about Admin Coaching: Instructions, Checklist Before Requesting Coaching