Caznay, you'll be sent a form in the post to fill in with you choice of schools. You can put down 3 but there's no point if you want them to go to only 1 of them.
Judith1, do you have friends whose children go to the school of your choice? If so you could be a bit sneaky and pretend they childmind your child after school so they couldn't pick up from two schools at once??!!!
Good Luck