No … you simply apply to the school you want and they will allocate places, priority goes to age, then address and so on.
My experience is on the northside and they’ve never turned anyone away ! Whilst the school your child goes to should be the closest to his /her home this is not always the case … I see lots of grannies taking their grandchildren to school daily despite the fact the kids live on the other side of town or beyond ! The schools don’t ask for proof of address only original birth certs.
Good luck with your christening and relax you only have to enrol by march of the year you child starts school.
best wishes.