Chances at Stanford?

<p>I want to go to Stanford for college but I don't know what to do. I'm a incoming sophomore and I'm in Speech and Debate, Science Olympiad, FBLA, Orchestra, and Robotics. I have a 4.0 GPA so far this year, 1 honors class, and I took AP Bio but I'm retaking it next year. ACT=27 (no prep, 1st time), PSAT=168 (no prep)_, SAT=1610 (i took this in middle school with no prep). is there like a set number of APs that I should take to get in? i want to major in biomed.
plus an unrelated question: Is it possible to self study for an AP History and still get a 5? my school offers AP Euro outside of school, but a lot of people say the online course doesn't help, so they had to self-study. or is it just too much information to absorb? </p>

<p>Thank you.</p>