A PS is one of the most important components of your application because this document, when written correctly, will offer your readers, namely the admissions committee members, a quick glance into your life story so far and which direction you plan to take. You are inviting the reader to share your experiences as you disclose who you are as an applicant. Through your PS, you are providing them a general picture of your background and qualifications, knowledge of which will allow them to evaluate your suitability for admission to their school accurately.
Consider these as you write your essay for medical school: "What do you really want to do in medicine? _ How are your grades different from everybody else? _ What are your original motivations and _ How have you confirmed those motivations?"