You can prepare for a test with the use of multiple resources.
The CITB OP/Spec HS&E test application is available to download for a small fee of £5.99. This app allows you to go through all the questions, and take mock tests to help you fully prepare for the test. Alternatively, you can purchase the CITB Health, Safety and Environment Test (For operatives and Specialists) for £12.
For online revision you can head to http://www.citb.co.uk/hsandetest