This particular family may know all this already, but it's not obvious to everyone overseas, so I'll jot down how the system works. For school entry, England looks at a child's date of birth and expects the child to join the year group that has other kids with the exact same date of birth. As far as I can see, there's no discretion and they don't care how much or how little you've done elsewhere, you're just forced into the appropriate year group to keep the chronology tidy.
For example, I have a daughter in year 7 (the first year of secondary school here). Every child in her class had turned 11 before 1st September of year 7 and will turn 12 on or between 01/09 and 31/08 before they move into year 8.
A child born in April 2006 who already goes to school in the UK will begin secondary school (year 7) in September 2017. Therefore they will sit the 11+ in September 2016 (give or take - some schools are a bit sooner, others slightly later). That would be the beginning of year 6 here, therefore they are in year 5 at the moment. Some applications have to be submitted late in year 5, so the family needs to focus on this now.
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Tiffin Girls' School has a designated area; see the determined admissions arrangements
. Use the journey planner
. Note the Admissions timetable
and General Questions