@pearle98 I am not a student. Calculus BC and Calculus AB are both one year classes. Many high schools will give extra time so every day in the fall to complete the material for Calculus BC. You can take either class in your senior year, might as well go for the faster paced Calculus BC if you are aiming for Stanford. You should make a sensible college list. The admit rate for Stanford is below 1% for white males in mathematics , and I think its about that rate for all ethnicities. Really being female only helps a tiny bit. Put Stanford there if you wish but make a sensible list based on your SAT/ACT scores and GPA. Match them to each school on your list. Be sure you are above the average and that school is one that should fit OK for level. Then figure out what else you want to do and other factors like geography, size, etc. Get into a Math Circles program now. That will help you assess if mathematics is a fit for you. Math Circles are sometimes called Euler Circles and Stanford offers that to high school students, if you are in Palo Alto.