I'd suggest just getting comfortable with medical articles. If you know how to read 🙂 and have good deductive skills u should be fine. For help with this just try doing full practice tests where this section is included. Also, if u are currently signed up with Kaplan's online or classroom course u'll get tonnes of practice materials and resources where u can find subject tests. With this u can practice RC without doing a full test.
Try grabbibg Barron's or Cliff's DAT. They are pretty cheap and they have practice tests that will give u an idea of the types of questions they can ask in this section. U can see a compilation of other helpful materials here: http://stu-dentdiaries.blogspot.com/ Hit the DAT study materials tab.