Sydenham does band, but uses the Lewisham yr 5 test results rather than any test of its own. Ditto all local authority schools in Lewisham. Intexas, as Katgod says, banding of applicants rather than banding of all kids reduces the disadvantage as, for example, if 50% of your applicants would be in the top band of the Lewisham test, then instead of all of them competing in that one band, your own test will moderate them into the top five bands of ability of YOUR applicants. Thus giving them a better chance. Banding doesn't increase a school's reach by very much if there's great demand - just look at Haberdasher's Hatcham! But it does make some difference.