Unless you're in the City of Chicago or the immediate suburbs, forget about all that. Go to the municipality or local government office where you will apply to take the test. The test application or the office should give you the information as to which version of the NEC or other codes that the test is based on. Find this information out for certain, because this is crucial for your studying. Then get the Electrician's Exam Preparation book from Mike Holt for the corresponding year of the NEC. Spend a few months studying regularly to become more familiar with the lay-out of the NEC, and develop speed in answering code questions. Aim to find the exact wording or answer for any question you find in the practice questions. Learn to do every type of calculation in the book, and memorize the location of the applicable code sections that the calculations are based on. For instance, residential and commercial load and service calcs, motor calcs, conductor fill for boxes and conduit, ampacity derating, etc. Study the calculation examples from the Annex D (Appendix D in the '99) in the back of the NEC. Try taking the free online sample exam from mikeholt.com. Also I found Tom Henry's Master Exam Workbook helpful, which contained practice exams which were in a form simlar to the actual test questions.