Khan Academy is a free website with pretty good lessons on chemistry, A&P, math... I've been out of school for quite a while, never took chemistry, hardly took any sciences, so I was worried about having to take lower-level classes I don't need. I haven't enrolled into any nursing program yet, but I think what's on there might be helpful for nursing students. I've been going through their algebra assessment so I can test out having to take it before taking science classes. Khanacademy.org