Krithi - Your daughter is year 4 - it is kind of too early to start preparation so I would hold for next year to start real preparation.
Regarding moving - are you planning to move now or you are just looking for info moving after exam - information can be change depends on that
You have to remember that your exam is on Sep 2019 - it is too early to say what kind of rule will be available that time if you are looking for info regarding moving after exam.
lets take your options with current rules
1. Dr Challoner's High School, Amersham - it is highly unlikely that you will get admission from Brent
2 Langley Grammar - Langley rule is changing every year - year 2017 start , they were ok to give admission from Wembley but for 2018 entry - they have changed rule , so you never know what will happen after 2 years
3 Upton Court Grammar - 2017 it was possible
4 Watford Girls - No chance from Brent
there are few schools you can target on top of your list
1) Henrietta Barnet - it is tough to get admission
2) SCD from SW Herts
3) Latymer - but you must move before Jan 2020 even before you got confirmed admission in March 2020 - this may change next year
4) Sutton school -
https://www.elevenplusexams.co.uk/schoo ... ey-11-plus" onclick="window.open(this.href);return false; - they do allow admission every without move
5) Kent -
https://www.elevenplusexams.co.uk/schoo ... nt-11-plus" onclick="window.open(this.href);return false; - this school you can target without moving
6) Bromley -
https://www.elevenplusexams.co.uk/schoo ... ey-11-plus" onclick="window.open(this.href);return false; - this school you can target without moving
7)
http://www.cchs.co.uk/" onclick="window.open(this.href);return false; - this school you can target without moving
http://www.csse.org.uk/" onclick="window.open(this.href);return false; - these schools you can target without moving
9) Some other schools from Slough consortium -
http://www.herschel.slough.sch.uk/" onclick="window.open(this.href);return false;
As you can see, your option will be widen if you are open to move but on same time, your targeting whole London surrounding and there is no way you can manage travel from Brent - you need to think and plan very careful - not all area are suitable for your family needs, your work, friends group etc.
If you are really thinking to move NOW - then I would suggest you to check Bucks schools since you have plenty of choices but please move on perm basis , I know few family has done it -
if you are not really thinking to move then please remember you have great school in your area - it is actually better then so many grammer school ...
http://www.whtc.co.uk/" onclick="window.open(this.href);return false;
On this forum, most of veterans do not like people to move because of just one school & somewhat I agree with that message!!
on same time , I feel that it is family choice and I respect every one to make own decision- so hopefully this info helps !