1. Check the link above.
2. Atleast a 1000 on your SAT (out of the math and verbal sections but get above an 1100 to have a better chance)
You need atleast a first class PFT score (225) to be considered (or thats what i was told).
3. They don't look at your high school GPA so don't worry about that. What they do look at is extracirriculars (you don't need a ton but look active), teacher recomendations, the two interviews you do with an officer (usually a Captain or Major), your SAT (like I said above break atleast 1100; a 1200 gives you a really good chance; a 1300 and above will almost guarantee you to have one of the highest SAT scores), your PFT (if you can't break 225 you better have high SATs), and show interest. The Captain i worked with held PT sessions every tuesday and thursday from September to December. By attending it showed him that I really wanted the scholarship and it helped get me a high PFT score. Most captains will set something up like this.