Read! There are many studies that show that students who read (whether magazines or classic literature) do better in school and on standardized tests.
Try new activities. If you are an athlete, don't be afraid to try an academic activity. If you are a Power of the Pen student, don't be afraid to try a sport. You never know what you might enjoy or be good at until you try.
Dive into your classes and seek enjoyment from your learning. Practice learning for joy, rather than learning for grades.
Review the College Center website if you have an interest in looking at colleges and requirements for college.