The admission officers of top universities have shared their opinion on what common mistakes the students make when writing their personal statement. Repeating what is written in the application form. Your essay is your opportunity to tell the admission officers something that you could not include into your application form or delve into something you wrote there.
There is no point in simply retelling your application or CV. Not writing to the specific university. Apart from telling about yourself, your statement should also demonstrate how you would fit in at the university you are applying to.
Explain one or two things about the university that make it the best one for you. Make sure that you are not writing only the general things that can be true for any university. It is not a good idea to start your essay by repeating the question asked or introducing yourself. Think about something to grab the attention of the admission committee.