<p>So far as I know, they're both about equivalent so far as MCAT prep goes. The major difference between the two courses is that 5.112 goes a little bit faster, and is able to cover completely different material in the last six weeks of the course (because they've gone faster).</p>
<p>[url=<a href="http://web.mit.edu/chemistry/www/academic/differences.html%5DThis%5B/url">http://web.mit.edu/chemistry/www/academic/differences.html]This[/url</a>] is what the Chemistry Department itself has to say about the differences between the two courses.</p>