I am in my early twenties and I plan on beginning undergraduate in the next two years. I’ve decided that I want to study law, medicine or possibly business. I am leaning mostly towards medicine. But I didn’t take chemistry or physics in high school. I was homeschooled grades 10-12 and the only science I took was some biology. So my question is this: what should I do to brush up on chemistry and physics before taking them in college? I know that the material in chemistry and physics will be harder than in high school. Should I take chemistry and physics at a community college before starting my four years of undergrad? I work a full time job and could probably take classes one day a week. Should I buy chemistry and physics textbooks and study from them? Could I use Khan Academy? What should I do?
See if your community college has chemistry and physics classes intended for people with little or no prior background. The one local to me has some that are equivalent to a high school introductory course; many are scheduled to accommodate working adults.
While you’re at it, take a math placement test and brush up on your algebra skills. You’ll need them for chemistry, physics, and statistics.
Regarding math as mentioned in reply #1, http://www.math.buffalo.edu/rur_index.html can help you check what math you may need to review and what math will be your likely starting point in college.