You need to think about where your child will be going to secondary school now - today!
Brent secondary schools are hosting open evenings and events. You need to go to
https://www.brent.gov.uk/services-for-residents/education-and-schools/apply-for-a-school-place/secondary-school/ for a list of the schools and their dates.
The site will take you through the process, the timeline for applications and how to apply.
You must get you online application in before 31st October 2018.