Grad schools don’t care that you make a great chicken casserole or play intramural bocce ball. They do care about those activities that speak to your suitability for graduate work. As a graduate student, you'll be called upon to do difficult coursework and research. You may have to teach undergraduate classes within your field and conceivably even design a course. And you'll have to get along with a diverse group of colleagues who will sometimes work very closely with you. Any experience in school, work, or your extracurricular life that speaks to those abilities is worth talking about.
The third paragraph of the body should contain the weakest argument, weakest example, weakest illustration, or an obvious follow up to the second paragraph in the body. The first sentence of this paragraph should include the reverse hook which ties in with the transitional hook at the end of the second paragraph. The topic for this paragraph should be in the first or second sentence. This topic should relate to the thesis statement in the introductory paragraph. The last sentence in this paragraph should include a transitional concluding hook that signals the reader that this is the final major point being made in this paper. This hook also leads into the last, or concluding, paragraph.