I want to be a music educator more than anything in the world. Music has been my life since i was very young. I have auditioned for the saxophone studio twice at my college and was rejected both times. I believe i have the skills to pursue music and i have many tell me i am at a beginning collegiate level and show promise to do well in music and I am always eager to learn.

My question is, is it possible with hard work and with collegiate level practice regimen and with the knowledge of how to practice, to learn the french horn within a year and be at a proficient beginning college level to audition and be accepted into a studio?

Is it possible; with hard work, a collegiate level practice regimen, and knowledge of how to practice to learn the french horn within a year and be at a proficient beginning college level to audition and be accepted into a studio?

Possible? Yes. Probable? No.

Since you have auditioned twice for the sax studio I wonder why you want to try for the Horn studio? With such a strong statement of "music being your life" we must wonder some things.
1. Why were you rejected by the Sax Studio?
2. What theory knowledge do you have?
3. What do you think are the 'skills needed to pursue music'?
Do you know all your scales (Major, Minor, Diminished, Augmented, Modes, etc) in two octaves or more at a rapid tempo?
4. Why Horn and not Bassoon, or Clarinet, or Trombone?

I play both Horn and Sax. I find Sax a lot easier than Horn. If you want to be an educator do you need to be in a studio? Hard work is not necessary but efficient work and time is; and a "collegiate level practice regimen" is vague as is "knowledge of how to practice".

As stated above, I would explore the sax rejection in depth before advising about learning horn. The practice regimen and knowledge of how to practice should apply to getting you into the sax studio as well as the Horn, or any other studio.