The focus here is on the "you." For UCLA especially (and UC Berkeley), we are now switching to a holistic review system. That means that UCLA will put more weight on any strenuous circumstances or hardships you write about in this section, since they will be considered in context with the rest of your application. This is your chance to explain more about what makes you unique, and what makes you stand out from the rest of the applicant pool. Feel free to delve into new topics, as this is really the only "free-response" section that you have in your personal statements.
The "your academic record" part of the question provides you a way to explain any low (i.e., D or F) grades you may have received during your high school career.