I am living outside the catchment area , so to put my daughter in a grammar school in 2020 when do I need to move ❓❓Do I have to move before or after she has done the test❓❓

I'm not sure -it's certainly not as clear as the Essex ones. i assumed before, but hopefully someone on here will advise. Have you looked through previous posts?

As per the "Transfer to secondary school" booklet for 2019 entry, a CCA move in date of 10th Dec (proof to be given by that date) was considered to be on time application provided

- you had applied to your home borough on time i.e. by CAF deadline
- you have named Redbridge school in your application by CAF deadline

In such cases, you had to provide the proof for change of address to Redbridge council by 10th Dec. Any change of address after that was considered to be late application.

https://www.redbridge.gov.uk/media/6698 ... inal-4.pdf

Please note - Guidelines change from year to year. Don't think a similar booklet for 2020 entry has been published by Redbridge council yet.
I would suggest you to drop a mail to Redbridge council to check.