Get one step closer to becoming a Oklahoma Unlimited Electrical Contractor with a prep course designed by 1 Exam Prep to help you conquer the required Oklahoma Unlimited Electrical examination. The course includes: Highlighting and tabbing locations for the 2017 National Electrical Code and OSHA book, so you can quickly and easily reference your materials during the exam (blank tabs or pre-printed tabs are an additional charge and are not included). - Hundreds of practice questions to help you become familiar with each reference book. - Testing techniques that are an indispensable part of these open-book exams.