The application process to medical school begins in May/June of the junior year and the primary application should be submitted to the American Medical College Application Service (AMCAS) or American Association of Colleges of Osteopathic Medicine Application Service (AACOMAS) no later than July. Secondary applications begin to arrive in August or September of the senior year and they must be completed and returned immediately. In order to be prepared for the next step, pre-health students should be aware of when the application process opens for the schools they are considering.