Some schools have a 2 year preclinical + 2 year clinical program and others have a 3 year pre-clinical +1 year clinical program, both curriculums usually have the last two years going straight through the summers. A 3-4 year residency followed by board exams would follow after you graduate if you want to specialize in a specific area, or you can choose to do an internship (usually for a year) after graduation, and then begin practicing if you do not want to specialize. Some people opt not to match for an internship at all and just begin working straight out of graduation.