Enroll in an SAT or ACT prep course, then retake the test before sending off any applications. A higher score the second time around, even if lower than average, still shows improvement that you can include in your college admissions essay.
Complete all admission requirements as early as possible and get your application in for early admission. Colleges often place less emphasis on standardized test scores during early admission because you apply before everyone else.
Maintain a high grade point average in high school by completing all homework, scoring high on all tests and completing any extra credit. High GPAs add credibility to your college application, even with a low SAT or ACT score.
Write a well-prepared admissions essay based on your goals for college and accomplishments so far in your life. Get help from your English teacher or school guidance counselor on structure and content.
Ask teachers and counselors who know you best for recommendation letters. A complete admissions application might include a recommendation letter from a teacher or professional reference who knows your work ethic and personality.
Apply to schools with a "test optional" or "common application" policy. There is a long list of schools who do not use SAT or ACT scores as deciding factors for admitting students. FairTest supplies the full list of these colleges.