Engage in Extracurricular
College admissions officers will look at your extracurriculars to try and figure out who you are and what you are passionate about.
It is more important to be highly involved in one or two extracurricular activities than it is sign up to be a member of every club or organization in your high school.
Find organizations that really interest you and stick with them throughout high school.
And, if you have the opportunity, take positions of responsibility and demonstrate leadership.
Also, having an after-school or summer job shows maturity and demonstrates character. Use the summer months to work, volunteer, or participate in a summer program at a college or university.