I would sit myself down and let myself understand what its like for me now in college, than i would give myself t goals that would need to be done before it attend college. I would ask myself to spend more time with school work, do better in high school, study more on my SAT'S, save money for college, and enjoy high school more and enjoy being a teen. I would let myself know it's ok to ask for help when needed. I would make sure when i am transition form high school to college, that I was ready to hit the books. I would let myself know that i can achieve my goals and i will achieve my goals.
If I could go back in time to when i was a high school, a word of advice i would give to myself is to work hard as possible and go beyond what hte teachers were teaching me.