Structure of the 11+
Most children who take the test take it in their final year of primary education. The test is voluntary and only taken by pupils who intend on applying for a place at a grammar school.
The structure of the test varies by county and by the exam board. When examined, English and Mathematics are generally tested on separate papers. Some tests are computer-based and others are written long-hand or marked on OMR multiple choice grids(Wikipedia link).