Do you have the sat score that allows you to take CollegeNow classes? If so, hurry and register - those will be challenging, will help you get into college, and will count toward your college degree thereby reducing time to complete it. And as long as you take them as part r your high school it’s free.
Useful classes would include calculus 1, chemistry, philosophy (<-rigor), plus one art or art appreciation or music appreciation class.