When you are applying for a position through an agency, they usually require you to take tests that will check your knowledge of specific areas. You can get the manuals for these tests ahead of time and study. While this like might seem a lot of work to get a job, it’s worth doing, since a higher score will move you up the list for the best jobs that come in. You will be considered more employable and thus offered higher jobs salary more frequently if you can boost your score on these tests.