Part One of the National Board of Chiropractic Examiners is a series of 6 exams of 110 questions. The best way to prepare for this style of exam to use practice tests to build your confidence, increase the speed of answering questions thereby increasing your score. This is a simple collection of 5 full practice exams for the Microbiology section of the First Part of the NBCE national Chiropractic board exam.