Many families sit two or more 11+ tests across different counties, especially at county borders (Kent and Medway, Bucks and Berkshire, Birmingham and Warwickshire).
The short answer
Multiple-test sittings are administratively normal but practically demanding. Each test has its own registration deadline, its own format and its own preparation needs.
The longer answer
The first decision: are the tests in compatible formats? Two GL-based tests (Kent + Medway) share most preparation. A GL test plus a CEM test (Kent + Birmingham) require separate format-specific preparation.
Where formats overlap, the marginal cost of a second test is low. The child sits the same broad preparation and just registers for both. Where formats differ, the marginal cost is significant — effectively two parallel preparations.
What experienced parents do
Most families realistically prepare for one primary format with secondary exposure to a related format. Three different formats across three different counties is rarely a sustainable plan.
What to avoid
Avoid: sitting tests in counties where you have no realistic intention of attending the school. The administrative overhead and exposure of the child to multiple test mornings is not justified by an option you would not exercise.
Practical next step
Confirm registration deadlines for every target test in early summer of Year 5. Cross-county tests have different deadlines and the consequences of missing one are often final. A small, deliberate action this week is worth more than a grand plan for the year ahead.