oMake sure your spelling and grammar and impeccable. If in doubt, consult a dictionary and/ or grammar book or ask someone whose knowledge of English your trust to read this through for you. Alternatively, send your personal statement to Get Into Uni Oxbridge editors http://www.getintouni.com who will edit this for you _ to perfection.
A great exercise to conduct before you begin to put together your admission essay is to start with a sample. This way you can see exactly what goes on a personal statement and you can also check out how the tone of the writer is and what they actually are emphasizing.