1. Keep in mind that there is a college for everyone.
2. Create a printed list of all the schools to which you are applying.
3. Studies have shown that applying early decision increases your odds for acceptance dramatically
4. Keep it to yourself.
5. Identify the teacher who is your strongest supporter
6. Learn the fine art of saying "no" to activities that take you off course
7. Set up a specific schedule during the year to study for any upcoming standardized test
8. Don’t believe all you read.
9. Let your academic passions guide your class choices
10. Make time to relax!
Each number is further explained here:
http://www.prepme.com/advice/top10-dont-worry.php