What should I include on my personal statement?

Oxbridge applications focus on academic merit, so extracurricular activities are not as important as your school may have led you to believe (although if there is something really impressive, don't leave it out!). What you want to convey is your love for the subject you are applying for, and why they should choose you (i.e. why is your interest greater or more important than other applicants). Often people choose to include and article or book they have read in their personal statement- this can be really useful, but do make sure that you actually read it, as I was asked about mine in my Oxford interview! The main thing to get across is your enthusiasm for the subject you are applying for.