<p>Don’t skip ahead unless you are sure there will be ‘enough’ math for you in your senior year and that the school will allow the skip. I’ve known of kids who got burned both when they ‘ran out of math’ and when the school refused to accept summer credentials.
You might also want to get involved in some math competitions. Look up AMC/AIME/USAMO and then find out if they are offered at your school. These are national math competitions that do not actually require advanced math knowledge but are quite challenging.</p>