Give your best effort on practice college entrance exams, such as the PLAN and the PSAT (both administered in the fall). These tests can give you valuable clues about your strengths and weaknesses as well as possible areas of career interests.
During registration in the early spring, make sure you sign up for challenging courses for your junior year.
Begin to think about possible career goals and interests.
Continue to participate in extracurricular activities and community service opportunities. Take on leadership roles when possible.
Consider getting a summer job—it can help you save money for college, and it might also tell you more about your own career interests.