I assume you visited them
Apologies if I'm wrong, but I assume that you don't have a lot of experience of the wacky world of 11+ tourism posting
.
A goodly proportion have no experience of the schools in question other than having taken their DC there on the day of the test...
As a pp has noted, @JustTealWriter , if you're in East London, your DD could just get the train for CCHS, presumably, if you don't fancy moving to the city? Unless you seriously can pack up and move, lock, lock and barrel into the CCHS priority admissions area and provide the required proof, by Saturday 31st, you've missed the boat for being considered IC anyway, and if your confidence that your DD's score would get her one of the 'all other applicants, regardless of place of residence' places - which is what that category is, not 'OOC specific' - isn't misplaced, this would give you much more time to find somewhere nice, if you did decide to move.
Long-distance commuter pupils dozing off in lessons and taking zero interest in participating in extracurricular activities were some of the issues prompting the Chelmsford grammar schools to introduce a priority area back in ?2013, but if you are within easy distance of Liverpool St / Stratford or any of the intermediate stations on the line to , your DD might not have a much longer journey, time-wise, than some reliant on buses from the outer edges of the priority area.
CCHSG would be another kettle of fish, although there are people who swear (or at least used to - haven't seen the claim much in more recent years) that travelling to the Colchester grammar schools from well within the M25 never takes their DC any longer than an hour, never any hold-ups on the A12 or local roads for them, unlike for any of us lesser mortals who have ever had to drive into Colchester at school drop-off time.