How likely am I to get into Cambridge as an American?

Thanks for all the advice guys, my gpa would put me at the top of my school considering that I’m taking all APs this year and I have A’s in all of them, that being said, I still have a C and a few B’s plaguing my 3rd quarter sophomore year as explained above. While my gpa could technically allow me to qualify for almost every school in California, I still have that C that sticks out. To clarify my earlier response, my main goal is to be able to become a professor leading a team of scientists as the PI. From what I know, many colleges offer dual MD PHD programs which makes the process of becoming a professor easier. At the end of the day, the MD is optional, it is a means to an end for me, as long as I can get a position as an associate/assistant/legit professor. Oxford and Cambridge are interchangeable to me, both are great schools, but Cambridge is ranked higher for bio sciences and has a higher acceptance rate.