The County of Rockland does not recommend, nor does it discourage, using test-taking guides. That being said, there are agencies that provide resources for those intending to take a Civil Service Examination.
The State of New York provides various Test Guides and Resource Booklets for local examinations. You may find an applicable test guide for your examination at the New York State Dept of Civil Service website.
The Civil Service Employees Association Local 1000 also provides resources for test-takers, including test preparation booklets, test preparation workshops, and online courses.
In addition, there are other test-taking guides that may be available in your local library or in retail or online stores.