<p>Which do you think think is easier to follow, and gets the material across properly?</p>
<p>Khan Academy is a lot easier to follow, but I doubt it’s detailed enough.
I’m not sure about biology, but for Calculus BC there are several topics he doesn’t cover at all. I think the MIT lectures are hard to follow if you’ve never seen calculus before, though. </p>
<p>In depth - MIT
Brief overview - Khan</p>
<p>Even though you’re not asking for suggestions or anything, but you could always try PatrickJMT on YouTube (he has tons of math videos. He’s really good, too.). There’s also GetAFive.com that has AP Calculus AB and AP Biology…</p>