Display your passion for the subject you intend to study in a short opening paragraph. While the first paragraph can openly depict your ardor and the effect the subject has on your life and thought process, it is also important to incorporate a more structured method thereafter. Try detailing your encounters with the field in the second paragraph. For example, if you are applying for a place in a language course, you might mention all the years you spent studying your chosen language and your recent accomplishment of reading books in that language.
Mention your achievements in your field of study. These could include any awards bestowed upon your essays, internships and how much you learned in your previous classes. This portion should portray you in a strong academic light as well as show the way you integrate information learned in class into other parts of your life, such as out-of-class creative writing or studying a subject similar to the program for which you are applying (e.g.: self-study of physics if you are applying for a mathematics course).
Discuss the way you feel you will impact your chosen field if allowed to study the course at Oxbridge. If your educational goal is to become a lawyer, you might mention the way you hope to fight for those without voices, such as children or exploited workers.
Provide examples of your organizational skills, your initiative and your enthusiasm for the subject with references to your past experiences. Though all applicants will have different experiences and methods, the dons at Oxbridge will want to know that you have a personal passion for the subject rather than an interest in financial gain after graduation.
Mention your extra-curricular activities. These could be anything from debate team to ballet, and their presence in your personal statement shows that you have good time-management skills and that you are able to work as a part of a team.