I want to go back to college to earn a degree, and change my career. I am 40 years old, and have been out of school for many years. And I was never really required to take a chemistry class, or many sciences classes for the degree I have.

Now I want to consider getting into the medical field, and I'm concerned, and maybe even intimidated by the science classes I will need to take. I don't know, maybe I will do great with them. It's just been so long I really don't know what to expect. So I'm hoping you can point out some good science websites to learn the very basics of chemistry. So if I can look over the website and I can understand a little, I will feel more comfortable and will feel like I will succeed in the class. But, if I struggle with chemistry or science in general, then I don't believe the medical field is a good choice for me.
Thanks in advance!