Focus on science-related classes in school. During high school and undergraduate school, focus on classes including biology, anatomy, physiology and chemistry. Learn as much about the medical field as you can to prepare you for medical school. You should also focus on mathematics.
Participate in a job shadowing. Talk to a local doctor or hospital about the possibility of job shadowing. During a job shadowing, you will follow a doctor around and observe what a day in the life of a doctor is like. You will get to observe physical examinations and other medical procedures. Try to shadow a doctor in the field you are interested in pursuing.
Volunteer at a hospital. Hospitals are constantly looking for volunteers to help aid in a variety of hospital functions from greeting and transporting patients to working in a gift shop. Volunteering in a hospital can help provide you with a feel of what working in a hospital is like.
Visit medical school campuses. Tour different medical schools. Get a feel for their campus and find out requirements for admission.