Some schools are popular and maybe full or oversubscribed. If parents would still want their child to get into these schools, one of the ways is to put the child's name into the school's Waiting List.
It is easy to do it by contacting the school directly (or your local council if the admission authority is run by them) to add your child's name on their waiting list. If an offer is eventually made, you will be sent a formal offer by the local council. Since the time you receive this offer could be in the middle of the school year, you have to decide to accept or refuse the place. Make sure you reply to both the new school and the council on time if you wish to accept the new school offer.
The good news is that schools’ waiting lists must be kept open up for at least the first term of each school year.
Creating a free personal account with British School Portal will allow you to browse through the schools easily on a Map-view. The school's profile and data such as school performance can be listed out for you to compare.
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BritishSchoolPortal.co.uk
A Free UK School Information Searching Platform
Further reading
How to find the number of spaces left at the school near you?
7 Steps of the UK secondary school admission
State School - In-Year admissions