Powerful Mind for a Powerful Game
If you want to improve your game, there are a few things I can recommend for you.
The first thing you can do is start doing some cold approaches on the girls that walk through the halls. Strike up a humorous conversation about something they are wearing or doing. For example, (this comes from Derek Rake) if you see a girl walking down the hall with very long stiletos, you can open with:
"You know, I used to have high heels like those, but I stopped wearing them after I got a ticket for breaking the Noise Code"
Another thing you can do is learn how to socialize and get to the center of social groups quickly. A good place to figure this out is in the book "conquer your campus". Having a strong sense of dominance and confidence can also go a long way in helping your game.
I think it's a great idea that you want to improve your game before college. Just remember one thing as you go about with this: NEVER try to avoid shame. Glare shame dead on in the face and tell it that you are not afraid to experience it. If you choose to run away from it, you will always live in constant fear of rejection. Abandon this, and you will be golden for the big leagues. So what you want to stay on a good basis with the girls in your school? You won't ever see most of them again in college, so there's no need to try to maintain a "Good Rep" with them.
"There is no better than adversity. Every defeat, every heartbreak, every loss, contains its own seed, its own lesson on how to improve your performance the next time." - Malcolm X