<p>
[quote]
Would getting AP credit in humanities during high school allow me to take less humanitites classes at MIT in any way?
[/quote]
Doubtful; it's pretty rare for people to be granted credit for classes which satisfy the HASS (humanities) requirement, and in the few cases in which credit has been granted, it's because people took humanities classes at the college level, not AP.</p>
<p>
[quote]
If I get those general elective credits, does that mean I will have more time to focus on my own interests at MIT?
[/quote]
Possibly. It certainly means that you'd be less worried about taking enough credits at MIT to graduate, so you could take a few grad classes or work a lot at your UROP without worrying you couldn't double-major. (To double-major, you have to get 270 units outside the General Institute Requirements. That's quite a lot if you don't come in with AP/transfer credit.)</p>
<p>
[quote]
Also, is it possible to have a double major AND a double minor?
[/quote]
Definitely. The minors have to be in different fields from your majors. But you can't have any more than two majors and two minors -- you are no longer allowed to triple-major.</p>