There aren't any special courses that would increase your chances of getting into MIT. However it is important to have good preparation in math and science and also to avail yourself of courses or opportunities that introduce you to engineering.
Registration for the Society of Women Engineers' 2016 Invent It Build It program in Philadelphia, PA is open now. This is a hands-on engineering event, for middle and high school girls with an informational program for parents and educators Be sure to go to the SWE website to sign up and reserve your space!
IIBI Registration on the SWE website