NLC has been publishing the Passbook® series of test preparation books for well over 50 years. Our Passbooks closely follow the form and substance of the test description and present the full format and content of the “real” examination” by providing step-by-step instructions, and hundreds and hundreds of questions and answers sequentially and systematically. The applicant “takes” an actual exam as he or she studies numerous authentic questions and problems, builds upon areas of strengths and works to overcome weaknesses.