Complete 8,000 points and show me proof. Worth one FREE test grade of 100! You should probably make an account to not lose progress. If you are comfortable enough on a subject, you can skip to the unit test and receive around 1,000 points for a perfect score, or you can go through the practice quizzes. There are also great videos, too.
www.khanacademy.org/math/ap-statistics
www.khanacademy.org/math/ap-statistics