If you have a child who is due to start Reception in September 2018, the deadline for applying is Monday 15th January 2018.
Please follow the link to apply online.
https://www.gov.uk/apply-for-primary-school-place
Alternatively, you can call Birmingham School Admissions on 0121-3031888.
If your address falls under Solihull Council, you will need to apply through them and not Birmingham.
The link for Solihull is as followed, http://www.solihull.gov.uk/admissions