Taking a pathophysiology course is probably the closest you'll likely get in undergrad to developing the kind of thinking that they expect of med students by the end of 2nd year. If the course is any good, by the end you should be able to think about disease processes, apply the relevant physiology and anatomy, and figure out how and why various organ systems typically become disordered (i.e., diseased).
I agree with a previous poster, though, that, if the course is designed primarily for pre-nursing and allied health folks (no disrespect intended) it probably won't be nearly as rigorous as med school pathophys. And so it may not be as useful. But if you are interested in it, it might serve as a good introduction.
In response to Bubbajones,
"Today my Ochem teacher said that there was more chemistry in med school than biology. IS THIS TRUE?
Im a sophomore and I just wanted to take some courses that could prepare me for med school. (Besides the pre-req's)"
That's a load of crock. The biological sciences predominant over the chemical sciences in med school by far. Some basic chemistry is necessary for sure, especially for acid/base physiology in the renal sections, but it's stuff like knowing moles, units of concentration, Henderson-Hasselbach, and the effects of acid and bases on titration curves. Some biochemistry is also necessary but most med schools will teach you the amount that you need to know. The O Chem they make you go through will not show up much in the future. That's mostly for weed out purposes.