August
Before heading back to school, review your objectives for this year—and for high school in general. As a benchmark, research a college you might want to attend and see how you stack up thus far with the average admitted student in terms of GPA and activities. If 9th grade could've gone better-you know who you are!—get yourself in shape for this year. You've still got time to improve that GPA and get more involved, so if you have some ground to make up, start now. You can't afford to blow it in 10th grade!
To Do:
Set your goals for the year—both academic and personal.
Review your schedule and make sure you've signed up for the right classes; see your counselor before classes start if there are any problems.
Consider taking a more challenging course load if you aced your freshman year (or a less challenging course load if you didn't).
Buy a calendar or organizer to stay on top of assignments, events, and your social life.
Look up data on at least one college (go ahead, just type a school's name into the search box on your left…)