You would need to keep a close eye on the residence requirements for each school - which, of course, could have changed significantly by the time comes for you actually to be applying to take the tests / applying for a place at the school. Some schools use the main address at the time of taking the test, applying to take it, or an even earlier date when considering applications. Others allow those who move into the area by the CAF closing date, or even a few myths later to be counted as 'in area' .
Do consider, though, that if you have to relocate part way into year 6 to fulfil residence requirements, you need to have a school place for your child to go to, or make arrangements to home-school.
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx