The Khan Academy

The Khan Academy is a free online school founded in 2006 by Salman Khan.  Khan stated he wanted to establish an educational institution that was free and open to anyone anywhere.  His academy currently offers over 2600 micro lectures on a wide range of academic subjects.  There are dozens of videos on chemistry, physics and math that would provide a great supplement to your course work.  There are also dozens of SAT prep materials all accessible for free.  If nothing else, I would encourage you to check it out.  This will take you to an NPR story on the use of the math videos in an historically failing school.