Make sure to do your best when filling this out. Not only will it help you organize your thoughts in preparation for filling out applications - it helps us write the best letter of recommendation we can. There is so much more to you all than we know. Don't be afraid to brag a little about yourself.
Also - make sure to have your parents/guardians fill out their section. You may have a tough time bragging, but often times those who have watched you grow up, do not.