As of 2015, there is no set time in which a person should enroll for the government, or civil service, practice test. Candidates should note that the tests for civil service jobs can occur as little as once every two years, states pse-net.com.
The different types of civil service jobs require one or more tests that candidates must pass before they can be placed on the civil service list. Interested candidates should check the job bulletin to identify which tests are required for their desired job. Study guides and free sample tests are available on sites such as pse-net.com. These sample practice tests can be downloaded and taken at any time.