Equipment and Timing. The tests are carried out in a purpose-built test room, which has the capacity to test up to 45 candidates simultaneously. Before starting, you will be briefed about the test session, the length of the testing process and the computer equipment to be used. You will notice the computer keyboard used is of a non-standard design and that certain tests may require the use of a trackball, joystick foot pedal, headphones or a mixture of the IT equipment. Test instructions are all given on the computer monitor for you to read and understand in your own time, and there is usually a short practice session before each test. There are rest breaks after about every hour of testing, but once a test has begun, you must continue to work until it is completed. All aptitude tests are timed so you should always work as quickly and accurately as possible. Try not to spend too much time on any one question, and do not be concerned if you fail to finish all the questions in each test - not all candidates do. The full test programme can last up to 8 hours, so it is a good idea to have a good breakfast, keep hydrated and feel fit beforehand. If you are programmed to take a restricted number of tests, you will be advised before the test session commences.